Malicious PDF — malware analysis report

Static analysis result for SHA-256 7882fad38e65f890…

MALICIOUS

PDF

87.6 KB Created: 2021-03-04 22:28:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5a612f81507cf4660652538a4179a809 SHA-1: 16bae5175eebdda88200d6527755854c6041d1d7 SHA-256: 7882fad38e65f890db9fd20de8e85a1c5ba47dbe5849791c6ef5c437e6f88ad5
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains numerous external links, including one pointing to 'resalured.ru', which is likely part of an SEO link farm designed to attract users searching for educational materials. The PDF's structure and embedded links suggest an attempt to redirect users to malicious content, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/wix?keyword=constructing+angle+bisectors+and+perpendicular+bisectors+worksheet PDF link annotation
    • https://cdn.sqhk.co/logulemuset/mmjbOcB/holmenkollen_ski_jump_game_tips.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496015/normal_601830f683c34.pdfIn PDF document text
    • https://cdn.sqhk.co/japexexuko/pOheE4D/cosmopolitan_las_vegas_drink_prices.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475375/normal_601fcc649c05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_5fd79136f3909.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/2ijkYge/best_cheesy_80s_music_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/rijolumexeb/Jjd0gje/piggy_book_2_chapter_3_skins.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477638/normal_5ffe914e0b5bf.pdfIn PDF document text
    • https://cdn.sqhk.co/zulatobi/gEvjjQk/assault_fury_mission_combat_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/9040181165.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/answer_the_question_tell_me_about_yourself.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/autodwg_to_dwg_converter_keygen.pdfIn PDF document text
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_12809041f7544241b5956fa9187c0159.pdf?index=trueIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_9b24ef9a9dfd455282179fcdfb3ebcca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/maduxo.pdfIn PDF document text
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_8162da4b652e4f28a28a9a915428391f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firudegix/gigefuwole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a4be88c-75a0-4d44-b0f8-767fe5d140c1/lagituwanutasuxisateluku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56d91bfc-19c8-4ea5-a20f-3d708287013f/what_is_the_correct_tension_for_a_sewing_machine.pdfIn PDF document text
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_dbb2af79c936449ba33593e653dc3859.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91b35c6-459e-4586-9a47-a82525d0a988/conversion_de_pulgadas_de_mercurio_a_milimetros_de_mercurio.pdfIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_6c341f5598cc4b26b515446263aaf5d1.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF447 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 5536 bytes
SHA-256: b48bba5173eae43f756f3feb76ca0dfecf7cf86387de485c3b9a26b2c3c1df5f
font_02_sfnt_off00011713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11713 10268 bytes
SHA-256: 0303a9a1f03d825c904adefb67b30e96ec864927771ce203d733441d00b9ba9f
font_03_sfnt_off00013a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8F 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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