Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fcd0e8c3e9e006f…

MALICIOUS

PDF

77.0 KB Created: 2021-06-01 00:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: de87e1e1878b1d53bf20ccbb20f672d1 SHA-1: cc2ffc2a9ea07a01fd15dca9d3b38d5f54b1c757 SHA-256: 1fcd0e8c3e9e006f046c7bcb23ae3f341b2af9b50b097bfae4bb2692025b514d
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains text related to 'cookie clicker 2020' and appears to be generated by wkhtmltopdf, likely as a lure to direct users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://archism.ru/pbw?utm_term=when+to+prestige+cookie+clicker+2020 PDF link annotation
    • https://kabirajozef.weebly.com/uploads/1/3/2/7/132740353/zafasisaval.pdfIn PDF document text
    • https://lubebubekawi.weebly.com/uploads/1/3/4/7/134714091/2003403.pdfIn PDF document text
    • https://luvinazomefad.weebly.com/uploads/1/3/4/3/134308035/5357586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478716/normal_6004766f3d980.pdfIn PDF document text
    • https://nizedavigo.weebly.com/uploads/1/3/4/8/134879015/8607ab2b67c.pdfIn PDF document text
    • https://pajobujanij.weebly.com/uploads/1/3/1/6/131606923/9070058.pdfIn PDF document text
    • https://xelixaxoso.weebly.com/uploads/1/3/1/4/131407481/9710969f1475f.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/kudezunaxi.pdfIn PDF document text
    • https://xopubisewono.weebly.com/uploads/1/3/4/5/134507782/gokavupad-fivabof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_6049d793a3912.pdfIn PDF document text
    • https://vojoritus.weebly.com/uploads/1/3/1/1/131164067/botewuwiridak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384030/normal_5fec17906aa5c.pdfIn PDF document text
    • https://nagozexifetuli.weebly.com/uploads/1/3/4/3/134340384/ae46a99d73707.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465012/normal_5ff0d81daddf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481289/normal_602c4d863d34d.pdfIn PDF document text
    • https://kexujutexaz.weebly.com/uploads/1/3/1/8/131858540/2013407.pdfIn PDF document text
    • https://fewabobur.weebly.com/uploads/1/3/4/7/134713859/wiwalolufesu-filizijotexa.pdfIn PDF document text
    • https://derufobi.weebly.com/uploads/1/3/2/6/132682106/1122001.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_600040eb5bce4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d30df9ea-6858-498b-8b5b-be6da6582920/microbiology_professor_salary_in_us.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/213cd10a-102d-4ce8-afe7-1d02a19b084d/whirlpool_washer_dryer_combo_instruction_manual.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_off0000eeb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB0 5336 bytes
SHA-256: 03c65ef736b7c421cea5fbce128a90d4515325018b30fabff832434afbfd89fc
font_01_sfnt_off000100f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F1 11008 bytes
SHA-256: 4e417abdeaf862fcf74ba949f1473b377d225fa3fbf4296508a7f51b4d763a71