Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd2eb6438bbe4d4…

MALICIOUS

PDF

77.7 KB Created: 2021-02-27 02:30:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 999d3a6225bee4b359133806f79e5823 SHA-1: 86d28eb9868033dcb5f8459bb6be64231a491e4b SHA-256: 3fd2eb6438bbe4d4ef1318d61376f22025d65e3906b7fcd00b4b0e1edb78c877
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs that point to external sites, including known malicious redirectors like 'yafferge.ru'. The document body is heavily obfuscated, but the presence of many external links suggests an attempt to lure users to potentially harmful content or phishing sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=1999+jeep+wrangler+owners+manual In PDF document text
    • http://microbestdigitalmeter.xyz/86112957540aq4zw.pdfIn PDF document text
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/d56638ad8.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/7QgD7ie/legends_of_runeterra_meta_decks_swim.pdfIn PDF document text
    • https://fejagirizow.weebly.com/uploads/1/3/4/5/134525681/janipowig.pdfIn PDF document text
    • https://nozubewow.weebly.com/uploads/1/3/1/1/131164313/zimawuza.pdfIn PDF document text
    • https://kazuvamelu.weebly.com/uploads/1/3/0/7/130738637/6775a128b1ea0.pdfIn PDF document text
    • http://wedipum.mygamesonline.org/john_deere_x320_hood_removal.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/8541089.pdfIn PDF document text
    • http://purpless.vip/kazizuwuriwogetaxixatazf1zav.pdfIn PDF document text
    • https://dibikavo.weebly.com/uploads/1/3/0/7/130738915/e935b3a21090559.pdfIn PDF document text
    • https://tedinuvade.weebly.com/uploads/1/3/4/3/134348171/8252362.pdfIn PDF document text
    • https://nesilinazum.weebly.com/uploads/1/3/4/8/134886609/suvov.pdfIn PDF document text
    • https://roxasudafuj.weebly.com/uploads/1/3/0/7/130740166/772b0.pdfIn PDF document text
    • https://cdn.sqhk.co/kilalovuge/gnjajih/sexux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/jonigilove.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/the_hidden_oracle_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/41429193446.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBE 5420 bytes
SHA-256: 4345cb2afcd89b54075fffaf56fe00779693fc66343d74e6c987b68a6fee0c9d
font_01_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 11696 bytes
SHA-256: c3668bcf3539db435c3ae0c390b5b13fd31b3b714a8fe1b40c13a6155d9dbbd4

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