Malicious PDF — malware analysis report

Static analysis result for SHA-256 33a473a554e535ca…

MALICIOUS

PDF

77.8 KB Created: 2021-03-22 08:15:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceebf1b0a201365c78cfd29e9528e02b SHA-1: da91594a23ab60368f153b352de6b0143a2bf561 SHA-256: 33a473a554e535cabb304272aac844538a031f553e8884a3a3fa5b047b5bc1a6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used for SEO poisoning or to redirect users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically indicates a mass of external PDF links, with one prominent example being http://denakisewir.epizy.com/zolanudu.pdf. The presence of ML_NYX_PDF_MALICIOUS and ClamAV detection further supports its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=after+dark+screensaver+bad+dog
    • http://gsmall.space/aj_android_gamer_gta_5qwim8.pdf
    • http://vomuniwawan.iblogger.org/bezajovixibevof.pdf
    • http://mabay.fun/14645435914kwe5o.pdf
    • http://forkidsshop.online/do_they_find_percy_in_the_son_of_neptuneaiwmm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://denakisewir.epizy.com/zolanudu.pdf
    • https://s3.amazonaws.com/tezofuretejom/47453262868.pdf
    • https://uploads.strikinglycdn.com/files/cfc28036-90cb-4f60-8b71-66f160d01523/lactancia_materna_en_ingles.pdf
    • http://mujujum.epizy.com/the_bloody_chamber_the_werewolf.pdf
    • https://uploads.strikinglycdn.com/files/4bffee30-6d09-4c08-933f-1fc8af5030d9/wejewuwaruratumovib.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/71224583859.pdf
    • https://s3.amazonaws.com/zalomi/nonigajil.pdf
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_9c07591a87ab471c9427f646d8f90a98.pdf?index=true
    • https://8b1d1a20-f0f3-43d5-aeb5-704ac988d6c7.filesusr.com/ugd/9dbc1d_67882a70bb3d4a97a6f6b84ae00ae769.pdf?index=true
    • https://502e425a-54a0-4661-a3e6-c6e116bdb13d.filesusr.com/ugd/10da26_5297ffbd9b734f05b4026404a7737c22.pdf?index=true
    • https://s3.amazonaws.com/mejigavukolu/zoetropic_pro_apk_free_revdl.pdf
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_89e236b60237427d896f2b4bcfcd635a.pdf?index=true
    • https://s3.amazonaws.com/tabobujimo/96737957335.pdf
    • https://s3.amazonaws.com/fixararololu/89524826235.pdf
    • http://vogizopenukese.epizy.com/80691956293.pdf
    • https://uploads.strikinglycdn.com/files/ea4d6cf5-ba0e-4849-bc8c-79af8896f69a/timawo.pdf
    • http://faguvepeme.rf.gd/wotirexeriwigiwikeso.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_off0000f2b4.bin
3211e98e89c50fb15c9e38deb8d2bbc06a534f298d4cb96b92ba84b6f76cd2c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B4 5412 bytes
font_01_sfnt_off00010539.bin
e10d3ead7d18e9385255992140bbcb03afc5cd4b2a0f5ec098c6e1e3681165b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 11084 bytes

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