Malicious PDF — malware analysis report

Static analysis result for SHA-256 95f7f4cf3865e384…

MALICIOUS

PDF

93.6 KB Created: 2021-03-18 03:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2e045b9b8f83419e62da2327824b0230 SHA-1: df23e45109a5126f846245ef2f4fe0167b6597b0 SHA-256: 95f7f4cf3865e384509f5fb8728722192ffec712fab410f51fdfe7f717eb3d92
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains or domains associated with link farms, suggesting a phishing or content distribution scheme. The presence of embedded URLs and the 'PDF_SEO_LINK_FARM' heuristic indicate an attempt to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/wix?keyword=hip+certification+mn PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467003/normal_601a3bcf93ffc.pdfIn PDF document text
    • http://usesalle.xyz/5887667546ykgv3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fd637a1a8025.pdfIn PDF document text
    • http://lamisorosasam.mywebcommunity.org/weefim_assessment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424027/normal_604b36d4e8369.pdfIn PDF document text
    • http://fortuneo-enligne.com/hill_climb_racing_3_gamel6t5c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_60126e03dd2df.pdfIn PDF document text
    • http://community-day.ru/is_the_arifureta_light_novel_finished2qmgq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462066/normal_5ffd6a0ad730f.pdfIn PDF document text
    • http://kazotapojiwi.mywebcommunity.org/calculus_of_variations_dover_books_on_mathematics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418191/normal_603530a68bacf.pdfIn PDF document text
    • http://vadosaj.getenjoyment.net/26721426381.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404745/normal_60080ad355c9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_603f8a0591917.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fed7d632a902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_5fd2f69bcadeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gegetebipa.atwebpages.com/canon_rebel_sl2_manual.pdfIn PDF document text
    • https://a8a2d6b8-6248-42a0-90a4-e25e421c2e59.filesusr.com/ugd/f63f29_b2ce56204a0f465fb2e44428fa508d8b.pdf?index=trueIn PDF document text
    • https://441dbedc-201a-49d7-bb2a-292980023e2b.filesusr.com/ugd/473728_64f1203a2ed44d13bdc0717e397a5687.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 4700 bytes
SHA-256: 410da1af926962f624ff63cf5695bafe43666bcca67dfa2801abd7bde016808d
font_01_sfnt_off000130c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C1 12496 bytes
SHA-256: b644dd36c6bd80dcf46fbfc100a86f85088ae4354a8251a125cd9079c2243364
font_02_sfnt_off00015b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B4F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2