Malicious PDF — malware analysis report

Static analysis result for SHA-256 908e82c7e54f6ae1…

MALICIOUS

PDF

92.0 KB Created: 2021-04-02 18:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fc9db95ca6f19321d46a97a54e5f394b SHA-1: 51e2c4b4d6c40f4150015a01325e95b3814619a6 SHA-256: 908e82c7e54f6ae119f6e2470a73bbcdc3614e337f653a1cb4526f40d420b66c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'golowaki.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text that appears to be a worksheet title, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://golowaki.ru/123?utm_term=kayarian+ng+pang+uri+worksheet+pdf PDF link annotation
    • http://ipoteka.net/present_tense_verb_chart_spanishc94gn.pdfIn PDF document text
    • http://fitness1.space/autumn_template_powerpoint_frees1wv3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462035/normal_5fc877f67506c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486190/normal_60018e625a49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459180/normal_6025e0d785ef0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_603ba4e31d163.pdfIn PDF document text
    • http://salet.store/bawafosozavexizijuvoxepmqwt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466398/normal_6059816ad7df3.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/0489f4c6-3bef-432b-9c66-77ca8b962426/pedipiwoputunomesas.pdfIn PDF document text
    • https://36ba0bd5-485c-4bd5-924f-6a5e18dcb854.filesusr.com/ugd/96419b_515709a6a1a343cbae1e66d8a67b8bbb.pdf?index=trueIn PDF document text
    • https://8dcf3d85-40eb-4350-b789-ae6ac2c46e24.filesusr.com/ugd/21d17a_e2770811660447a6af82833a5d043a85.pdf?index=trueIn PDF document text
    • http://kodinola.rf.gd/32789841398.pdfIn PDF document text
    • https://da6a6a96-7907-4aac-bfe3-592928b14ca9.filesusr.com/ugd/39e844_365f467adcce42aca4be4216f760ed29.pdf?index=trueIn PDF document text
    • http://sojatuduko.epizy.com/36028912652.pdfIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_909ffc44196246b981252084794d1136.pdf?index=trueIn PDF document text
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_6a807914fbf34812bd4c74d95858f5ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2fbdec4-e239-41e0-a4e4-145b92d44066/20695082837.pdfIn PDF document text
    • http://jolivawojo.rf.gd/zigikekugofomosasunexudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c57ae70f-d9e9-4604-ad3d-fde726a3fac3/wii_health_and_safety_screen_copypasta.pdfIn PDF document text
    • http://voxuluvaj.epizy.com/anorexia_nervosa_questionnaire.pdfIn PDF document text
    • http://zetakid.rf.gd/50484847020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65397c5-09b2-4994-8a9b-ada0c6bc5656/49622361501.pdfIn PDF document text
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_96e71ad1599445e3a836678b092b5b45.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 5496 bytes
SHA-256: 4b0cb515ec8ddc7b51ffc76f2c37c41205d7a99f347b9c1a198f5f9e32b6b03d
font_01_sfnt_off000139c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139C1 11864 bytes
SHA-256: 4c00e0b3089283aa6b613b43bcc2c37c1f810a4fc9ccdecd85246f11cc45b981

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