Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d39033cedb0dcf7…

MALICIOUS

PDF

76.3 KB Created: 2021-04-18 15:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ac7f38c8637d4d887182717bc15750e4 SHA-1: 2ab632c191a9f87ba857e354d9033e0cb0df051a SHA-256: 3d39033cedb0dcf77bcbc9ec0b1363f7257c7db96e0c2b6a69cc17a7f631696c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, with one prominent URL pointing to 'fokemale.ru', which is identified as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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=the+odyssey+book+2+quiz PDF link annotation
    • http://flash-sar.online/fitemoxoxalujederamizuwet0ivg7.pdfIn PDF document text
    • http://introdom.ru/747397571932uw90.pdfIn PDF document text
    • http://triple-doska3.club/lock_screen_dont_touch_my_phone_stitch_wallpapernbgmg.pdfIn PDF document text
    • http://vezdesami.ru/rikalumuzec4cq4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460233/normal_5fcf471138c02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488133/normal_6030ac4d4cefe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_6035886656264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453100/normal_600ce82015a35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_606ce13f908fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476601/normal_602d8a9b812af.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/edae97f4-a452-4cc3-99aa-5854df798b34/emergency_care_13th_edition_exam_1.pdfIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_3f9212de58684246b12a1ffc9b1189b1.pdf?index=trueIn PDF document text
    • http://vewokepewaki.epizy.com/how_to_find_a_certain_breed_of_dog.pdfIn PDF document text
    • http://zariwatanelil.rf.gd/62926897487.pdfIn PDF document text
    • http://jebejabekuja.epizy.com/factor_structure_of_the_barratt_impulsiveness_scale.pdfIn PDF document text
    • http://kavimefejemud.rf.gd/nomazejemabexokugiwamate.pdfIn PDF document text
    • https://85ed388a-52e0-4e79-9737-9d4b769dda71.filesusr.com/ugd/bb10c5_53e542ea45454d07be55fae1e6e50bef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0963f110-4c2d-4bb4-b901-adbb4fda6fa9/66983558031.pdfIn PDF document text
    • http://xevezowa.rf.gd/32203533036.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF2 5136 bytes
SHA-256: 7591783bdc22f671478ed6774731d497971e8630ea7e8973627d605d455516d2
font_01_sfnt_off0000fe79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE79 10956 bytes
SHA-256: 24acabaed0926d107ae945a8d26aea894e1a3ee7614113dbe35515e4af3355ae

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