Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6329e8720ac28ea…

MALICIOUS

PDF

74.8 KB Created: 2021-02-20 00:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fd889e97391d637efbf7c853d3b7221e SHA-1: ab787e4b89ae5b2d3b2110088f26795dab654256 SHA-256: a6329e8720ac28ea63d86e07162c49321a86555f17b2f51af29004dd991af9e9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/123?utm_term=homelite+chainsaw+parts PDF link annotation
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/2521968.pdfIn PDF document text
    • https://fuxexuwamonem.weebly.com/uploads/1/3/5/3/135387882/gatisexovawejol.pdfIn PDF document text
    • https://wuwenesugujiku.weebly.com/uploads/1/3/0/7/130739695/5800738.pdfIn PDF document text
    • https://zuwadakake.weebly.com/uploads/1/3/4/6/134664894/35f2e17df3c.pdfIn PDF document text
    • https://cdn.sqhk.co/tivuzofep/Pln6jaa/96627690804.pdfIn PDF document text
    • https://cdn.sqhk.co/sofopiro/U0gie5D/sustainable_development_goals_upsc.pdfIn PDF document text
    • https://cdn.sqhk.co/vekudaselux/jghbJih/hideaway_bar_milwaukee.pdfIn PDF document text
    • https://cdn.sqhk.co/nifodotiriru/hfeGJs6/6790185714.pdfIn PDF document text
    • https://cdn.sqhk.co/kasesiseb/pveSejf/stack_switch_2960x.pdfIn PDF document text
    • https://samabuwe.weebly.com/uploads/1/3/0/7/130739499/mixiw_wizabiviloma_wogigifimu.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/gcWyBic/my_talking_tom_2_games_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/duravukikemo/6zJ9hWX/cookie_cutter_maker_machine.pdfIn PDF document text
    • https://gogodelile.weebly.com/uploads/1/3/0/9/130969080/8634727.pdfIn PDF document text
    • https://nupewaxupojiga.weebly.com/uploads/1/3/4/0/134042887/leguripapafev.pdfIn PDF document text
    • https://cdn.sqhk.co/xidujefonari/aiegfqC/80_90_slow_rock_music.pdfIn PDF document text
    • https://lopufofogepuxal.weebly.com/uploads/1/3/4/6/134695200/sunipaxize.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_off0000e6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EC 5224 bytes
SHA-256: a5148d1431dad2617cdac8eaed68c635e49ebf1607aacb019fa949e745eb0ed2
font_01_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 10996 bytes
SHA-256: c22252cb31fc8b37b7b70799011e188325bee8ba0fb65e34f0b0581c679b1b42

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