Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb876712f0cc3900…

MALICIOUS

PDF

88.9 KB Created: 2021-02-22 20:26:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 116a2a8b7dfa50a64e6dc7fb1e78cf13 SHA-1: c677d4e3270a508b88c84abe54f3841b204e0302 SHA-256: fb876712f0cc390071e11c6c3772a99d61913af640a76b839d351f34d60b7cc0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV heuristic also flagged this PDF as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, appears to contain keywords related to a game walkthrough, likely used as a lure to attract clicks to the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9386

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
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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/strik?utm_term=metro+2033+redux+walkthrough+xbox+one PDF link annotation
    • https://birivuben.weebly.com/uploads/1/3/4/6/134618962/wudexoza-rimisorilo.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/ICjfKRg/7741024927.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/e7ggjd1/vr_escape_game_2_level_19.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/dxvgdRL/22132035732.pdfIn PDF document text
    • https://tajewarupimef.weebly.com/uploads/1/3/2/6/132681391/pulezuj_bukirigorap_tefosetu.pdfIn PDF document text
    • https://meluwirukumipi.weebly.com/uploads/1/3/1/4/131483006/loligeruromo_nemamebalalibi.pdfIn PDF document text
    • https://ziloxewimufe.weebly.com/uploads/1/3/0/8/130813797/rukijobi-pevokim.pdfIn PDF document text
    • http://worodariravo.22web.org/asphalt_8_airborne_android_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/heqhaY2/bypass_lg_pattern_lock_screen_without_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/visukodo/1XAhehb/54255483900.pdfIn PDF document text
    • https://cdn.sqhk.co/gukijenof/ijhahhn/gugowidifaxixi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403408/normal_5fcf4dc938e33.pdfIn PDF document text
    • https://cdn.sqhk.co/timugulirebu/gcXcZge/free_bubble_breaker_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowatutijetig.rf.gd/30_day_ab_challenge_nutrition.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/sundered_elder_shard_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/74679662836.pdfIn PDF document text
    • http://fonajuwowo.epizy.com/donor_thank_you_template.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/rebulusovofa.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/bivuzelibafegunatasenipo.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BE 5716 bytes
SHA-256: a681b103b3c9de99acd837fe0c2458c571402b6d0235ecf10adc1ec3374725fc
font_01_sfnt_off00013d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D50 10928 bytes
SHA-256: 26e0f9bf255a17081e4c2c0989a3269d03784d7e7bec43be887ca8183241be28

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