Malicious PDF — malware analysis report

Static analysis result for SHA-256 3447cb9b446ceb01…

MALICIOUS

PDF

68.3 KB Created: 2021-02-06 19:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c0dcfa0eb1a1035ad01925b0486ec989 SHA-1: 974bb477e4c1fe9345e8205a299776ed90b5e222 SHA-256: 3447cb9b446ceb01c629c24c164a37c67810d38e049c1215865b6c0a2ec100dd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of multiple external URIs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary purpose is to redirect users to potentially harmful websites. The document body, though heavily truncated and obfuscated, contains references to 'latest movies sites free', which could be a lure.

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://leonvi.ru/wb?keyword=latest%20movies%20%20sites%20free PDF link annotation
    • https://nilazarokidimud.weebly.com/uploads/1/3/4/4/134495838/foxakisemi.pdfIn PDF document text
    • http://denizan.com/bileiklerin_adlandrlmas_testt34bq.pdfIn PDF document text
    • http://f1l3download.site/wifedotitoresetutogefifkn7tm.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/wufev-jabojoto-getabew.pdfIn PDF document text
    • http://ultra0.space/nilumulin41eiy.pdfIn PDF document text
    • http://nominasacra.ru/dark_souls_3_chaos_infusionhnj1r.pdfIn PDF document text
    • https://xagufiwukana.weebly.com/uploads/1/3/4/6/134694649/ec729fe5.pdfIn PDF document text
    • https://zedabobosarafon.weebly.com/uploads/1/3/0/8/130813357/e87e600c7.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/7bc1097ee73492.pdfIn PDF document text
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/nevoferokopexef.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/mepelifemo_sapekudedumogi.pdfIn PDF document text
    • http://sezituza.66ghz.com/83546478101.pdfIn PDF document text
    • https://fasiwuwazaxeba.weebly.com/uploads/1/3/1/4/131438460/c6c49e0c9f1e.pdfIn PDF document text
    • http://hookup153.space/jidapusaw6ynty.pdfIn PDF document text
    • http://hookup158.fun/85843017109yoyoa.pdfIn PDF document text
    • http://milanomodaitaly.site/d2x_cios_installation_guideeze88.pdfIn PDF document text
    • https://wezusutuxalik.weebly.com/uploads/1/3/1/6/131637092/getodiji_nufupojom_ximutaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cf17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF17 4884 bytes
SHA-256: 364e1582cfc269a61247328acaf9b144fa96a56aa185f155794a390cc16cb708
font_01_sfnt_off0000dfa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA7 10776 bytes
SHA-256: 6d3101b93e248cbd91f3b8066f75ac8dd325ba8410c8bc20624c6d510ce7ef78

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