Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa4efdbb18ff469…

MALICIOUS

PDF

86.3 KB Created: 2021-04-18 10:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fa291ec0b771a043be0b1d72a5f9e59 SHA-1: 7fca829e0c53c0effed712f30f1e4a8f18787942 SHA-256: 1aa4efdbb18ff469460fdc4dbc97538f9a2d26f86a73d924f95d62f202f8704f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, many pointing to potentially malicious domains, suggests an attempt to redirect users to phishing or malware-hosting sites. The ClamAV detection as Pdf.Phishing.Trojan further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/strik?utm_term=principles+of+biochemistry+5th+edition+pearson+pdf
    • https://cdn-cms.f-static.net/uploads/4456116/normal_604e9f1d4ea73.pdf
    • http://faketikus.22web.org/accommodation_request_form_ielts_listening_answer.pdf
    • http://ouily.xyz/saxofay0s4j.pdf
    • https://static.s123-cdn-static.com/uploads/4370547/normal_5fef42ede5bc6.pdf
    • http://vashe-zdorovie.xyz/32275289604zry9w.pdf
    • http://gumoximowukowot.iblogger.org/understanding_and_using_english_grammar_vk.pdf
    • http://servempieza.site/sparknotes_macbeth_act_4_scene_1_translationf726j.pdf
    • http://monoga.space/pill_reminder_app_android_source_codemwrh6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_65adafd08d8349d4a59b534f73c9ad26.pdf?index=true
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_fbf79b3ae0b245d6852ff3059b6fd53d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1c86f292-d211-4217-8246-72e5db43c418/casio_calculator_fx-9750gii_manual.pdf
    • https://uploads.strikinglycdn.com/files/9cd0276c-f394-4daa-9eaa-37556fe4e42f/bon_iver_i_cant_make_you_love_me_nick_of_time.pdf
    • https://uploads.strikinglycdn.com/files/1697d119-e10b-4b31-bcc5-0d5f8ebf92bf/wepowalopuvunixuf.pdf
    • http://majilutiwuxas.rf.gd/kenmore_70_series_washer_problems.pdf
    • https://uploads.strikinglycdn.com/files/19ba476f-dd22-4bad-940f-22b4099e1042/66749633746.pdf
    • https://uploads.strikinglycdn.com/files/935c3674-aadd-4eaa-b11a-a45638e2c197/busozadime.pdf
    • https://uploads.strikinglycdn.com/files/9f4bacd5-f187-40c8-88cb-abf7fb6f8f2a/tobopafawobuna.pdf
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_87c58fd3cfb948168d606c2fba921537.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbb2.bin
32cfbac6d5ea3cbbd61009e64eaa70b8a476d27e47d2356025e4c79fe5de9e87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 5760 bytes
font_01_sfnt_off00010f27.bin
92af9930891a126318f8c09440e2d00d3c4a14ba0c7cf58120d752f420b06120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 10888 bytes
font_02_sfnt_off000134ae.bin
1621a87b6bc266bc0e3d5871723ec36fa76dd6d2c9fb76f212020cc469043148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134AE 16076 bytes

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