Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ae51f2cd8bf0ed…

MALICIOUS

PDF

77.7 KB Created: 2021-03-22 11:16:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 8b3c116e7b3a602086ae20257ae2370a SHA-1: 5adfea7b51bbbef6c3c5c0e56daaff9cac9996c2 SHA-256: 99ae51f2cd8bf0ed12c6ca6ef603f80ce0b22676cb14e4b65eb2c7c561d11f7b
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains numerous embedded URLs pointing to potentially malicious or disposable domains. The PDF structure and embedded links suggest an attempt to redirect users to external sites, likely for phishing or malware delivery. No scripts were extracted, but the presence of malicious redirector links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wix?keyword=anime+raw+list+tumblr In PDF document text
    • http://nizagose.66ghz.com/battlefield_v_firestorm_game.pdfIn PDF document text
    • http://mevukavotidu.getenjoyment.net/c_programming_objective_questions_and_answers_download.pdfIn PDF document text
    • http://2220202.ru/is_inkscape_safe_for_macsj78l.pdfIn PDF document text
    • http://bivaxopepukoxi.getenjoyment.net/arnell_group_pepsi.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/bsc_nursing_1st_year_syllabus_ruhs.pdfIn PDF document text
    • http://forovasax.medianewsonline.com/83307548356.pdfIn PDF document text
    • http://fujexitekubolok.22web.org/51233729295.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/esv_hear_the_word_audio_bible_free_download.pdfIn PDF document text
    • http://info-pages.ru/love_story_erich_segal_book_online8393u.pdfIn PDF document text
    • http://netekepipavosis.sportsontheweb.net/saduvosoliwopa.pdfIn PDF document text
    • http://fishing-rods2.club/how_to_use_rowenta_pro_iron_steam_stationa7c1q.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a017f95-2542-4e90-b07b-8828adba89ef/what_are_the_signs_of_childhood_trauma.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/96263029495.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/arihant_integral_calculus_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4d49420-0277-444f-ac22-f127e76c8abc/libipiziwelijeduwul.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/77474827478.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/invitation_letter_template_for_conference.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/wifibufeposofojovarakunat.pdfIn PDF document text
    • http://momerulazem.rf.gd/essential_korean_words.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b7fd57-68a8-4ff2-a817-170f2c496790/dujozuwivimebeteronewux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c2c2577-c6f0-45d8-be83-3f4a662dc9e5/gikej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2e650ba-6fb8-49de-9d83-b8913f369600/what_does_the_acronym_smart_stand_for_when_referring_to_smart_goals.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/cbse_class_8_maths_factorisation_worksheets.pdfIn 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
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3E 5052 bytes
SHA-256: 974e002698dd548f70533f65e98bea35d60dcb2ac5f43409d776ab1a2af02d5e
font_01_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 11276 bytes
SHA-256: 1d12b71e5036fe500cd9c3bc4ddfaafad5e57521c27cfe73f24794afeb1c38e5
font_02_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 16388 bytes
SHA-256: 4189bb5d82d37c3b06c761c00ca3b3c8a7a7312639514cd6a20481e76712d457