Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d99b221d416fd2…

MALICIOUS

PDF

84.8 KB Created: 2021-03-25 17:51:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99bed07f836f9135a1fc3cdb5549418b SHA-1: e08e28879afe2015ab7ea084a342eff54fa81884 SHA-256: c4d99b221d416fd293b41caf9d59670ec33c2bb464ba934ed2f771160f95d430
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, with a significant number pointing to potentially malicious domains, indicating a link farm or SEO poisoning tactic. The primary URL identified is https://midufefew.ru/award?keyword=ap+chemistry+balancing+equations+practice+pdf, which is likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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://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://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

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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