Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9815efa004fa67…

MALICIOUS

PDF

81.8 KB Created: 2021-03-25 17:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6809c9135f1cfc95f8e54f462d927734 SHA-1: 8e6a75d12a1f0f4488809a1eba3d3b398048e69e SHA-256: fa9815efa004fa67d8b06adff425da897763f5595f873bcdb437b6b265028a5f
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are SEO-themed and point to other PDFs, suggesting a link farm or redirection mechanism. The primary URL, https://midufefew.ru/award?keyword=ap+chemistry+balancing+equations+practice+pdf, is suspicious and likely leads to a phishing or malware distribution site. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7553

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://midufefew.ru/award?keyword=ap+chemistry+balancing+equations+practice+pdf
    • https://cdn.sqhk.co/zalenelavup/tjaB2gi/duxodazalabeme.pdf
    • https://cdn.sqhk.co/digatamale/chhBlwq/nuwelesinugoderoxeka.pdf
    • https://cdn.sqhk.co/gukokefa/oTgdthg/park_masterson_basketball.pdf
    • https://cdn.sqhk.co/lilaxikixo/hBjjxgi/primitive_survival_tool_youtube.pdf
    • https://wufikasuruxur.weebly.com/uploads/1/3/1/6/131636700/d5d85e4be638eb.pdf
    • https://petuxomurekag.weebly.com/uploads/1/3/0/8/130874153/bfcb530.pdf
    • https://wolapegod.weebly.com/uploads/1/3/0/7/130776073/saluwupe_tezune_nogov_rigelob.pdf
    • https://cdn.sqhk.co/lexaxemiji/p0jjojd/pixel_buds_review_uk.pdf
    • https://cdn.sqhk.co/sawijewabob/icj5get/10082202632.pdf
    • https://wuvumivew.weebly.com/uploads/1/3/1/4/131410662/6236117.pdf
    • https://cdn.sqhk.co/wularumijif/WNbghxH/download_warship_battle_3d_hack_mod_apk.pdf
    • https://kulojimafad.weebly.com/uploads/1/3/4/5/134518235/a0b7ac13.pdf
    • https://cdn.sqhk.co/sevijeruba/oQgdiNL/like_father_like_son_car_tattoo.pdf
    • https://cdn.sqhk.co/zarejesorufo/hEgejeE/filopibex.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://warozuvade.epizy.com/present_perfect_or_past_simple_exercises_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/56b7b913-4ab4-4364-9dc7-a3d9e8f24c11/pearson_grade_3_math_workbook_answers.pdf
    • https://s3.amazonaws.com/resabomibogodaw/gurususapawakagiwev.pdf
    • http://milibelibagusez.epizy.com/success_books_to_read_in_2021.pdf
    • https://s3.amazonaws.com/donukadizolin/sesegezajikulexo.pdf
    • https://uploads.strikinglycdn.com/files/42f55d90-40ac-4f5a-9db7-a3dfc5eb38e6/nedebotorula.pdf
    • https://s3.amazonaws.com/xapota/66763068273.pdf
    • https://s3.amazonaws.com/jubiferekaka/35763731077.pdf
    • http://gajumelixidolob.epizy.com/why_the_enlightenment_was_important.pdf
    • https://uploads.strikinglycdn.com/files/9c12a9ec-4dae-4068-93d3-28bb38f59b06/nawezitenonadetafu.pdf
    • http://kopinakitiwodad.rf.gd/65003554831.pdf
    • https://s3.amazonaws.com/wivunonovef/zoom_h2_manual.pdf
    • https://uploads.strikinglycdn.com/files/878e2177-ab51-4173-ab0b-b7df4c306ffd/xarutibafadane.pdf
    • https://uploads.strikinglycdn.com/files/6869d7f5-5025-4c37-9d36-f094c42209a5/trevor_noah_audiobook_apple.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010abd.bin
85e2537aa3cc4f689db2da3c30e6fdbd1b32f2dbdfe2c0a3fa5d28b8cc49ee20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10ABD 5928 bytes
font_01_sfnt_off00011ebc.bin
1fb9e111cb3905adfb02223e7d306fa829c302d4dfb6eac78fd461f01192830e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBC 10780 bytes

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