Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba4bd14bcca48fd…

MALICIOUS

PDF

78.3 KB Created: 2021-02-28 21:47:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 490fbeb82e2f7dcce957f9899f980c44 SHA-1: 9fb0347286500e41b5814bf70f850f3df4af7d99 SHA-256: bba4bd14bcca48fd94ecab5763b958eec1c9097e72032e8cf2292044adee94c9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The embedded links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://druttle.ru/award?keyword=blue+and+white+christmas+tree+meaning PDF link annotation
    • https://cdn.sqhk.co/xovepejegosi/cX62YTX/kiwewanavini.pdfIn PDF document text
    • http://leledup.mypressonline.com/the_highwaymen_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/hkiixhg/slither._io_mod_apk_android_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pugepavofu/hgtoejh/fefugejukezonofez.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/90550519528.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/julilimosijemos.pdfIn PDF document text
    • https://cdn.sqhk.co/puruwedisuma/Xo2ZuQI/add_zero_to_beginning_of_array_matlab.pdfIn PDF document text
    • https://cdn.sqhk.co/nolovojawek/eQjajfT/w3layouts_bootstrap_templates_free_download.pdfIn PDF document text
    • https://xitorudabetibom.weebly.com/uploads/1/3/1/8/131856365/vabopilaxawovoroji.pdfIn PDF document text
    • https://pidufemimin.weebly.com/uploads/1/3/6/0/136054052/5240720.pdfIn PDF document text
    • https://sodolujakuxef.weebly.com/uploads/1/3/1/3/131398606/wuluwomefoluwaf.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/bCibigq/slots_for_real_money_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/rukefureku/jgU9jdu/texas_longhorns_logo_png.pdfIn PDF document text
    • https://cdn.sqhk.co/mitukutowum/jamWoVJ/5249736937.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://dowegumorugujon.epizy.com/limifewetuwinufinek.pdfIn PDF document text
    • http://fesenobonirizu.epizy.com/nadi_astrology_books.pdfIn PDF document text
    • http://bonoburadik.epizy.com/62784502111.pdfIn PDF document text
    • http://nutujetis.rf.gd/27037306315.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 5268 bytes
SHA-256: 6d1bd6e4184f8afeb0082bbe323761ed75da3d1c862f1aab61f3e3daa7be72fb
font_01_sfnt_off0000f9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D3 10440 bytes
SHA-256: 676635bc08228a67b5a67348b65dcf17024509d97f755011537f9759dc7a4a5f
font_02_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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