Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d988c75bbb70d81…

MALICIOUS

PDF

73.4 KB Created: 2021-02-24 05:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f8058de3d1edabdf1668f326e43f54ed SHA-1: 52a20dbac8836511bf34525883f857ead2559494 SHA-256: 4d988c75bbb70d817470419a412c4b666e142abfaf1defc06c9c51fc4cdea598
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a significant number of external links, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies a lure impersonating Facebook, directing users to a redirector URL. This indicates a phishing attempt designed to steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://boxuvudadutubip.weebly.com/uploads/1/3/2/6/132695546/junarufesubukivijig.pdf.
  • 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/strik?utm_term=tuesdays+with+morrie+aphorisms PDF link annotation
    • https://boxuvudadutubip.weebly.com/uploads/1/3/2/6/132695546/junarufesubukivijig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416144/normal_602334e121264.pdfIn PDF document text
    • http://bcpzon4segurabetaviabcp.com/lol_manual_patch_schedule_2020ptf64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5fd33b277024f.pdfIn PDF document text
    • https://kaxawoxo.weebly.com/uploads/1/3/1/0/131070710/gozakusibusopubujabe.pdfIn PDF document text
    • https://sabizedikidoxar.weebly.com/uploads/1/3/2/6/132681903/1926310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5fd0852460adc.pdfIn PDF document text
    • https://wodarobasuk.weebly.com/uploads/1/3/5/3/135300597/b3995fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fdbfcea90caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443821/normal_601c5f4326110.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_6019fa72eb473.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485172/normal_60090afdd2f29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5fdbad226f37c.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/gateme/djsi_2019_report.pdfIn PDF document text
    • http://mumupaju.epizy.com/duwivinuluferusono.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/imagine_math_answers_combining_like_terms.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/codigo_ascii_para_signo_grado.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_off0000e36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36F 5308 bytes
SHA-256: 0cc86d7153ec6e6508fe12e7942763c0dd897b11b7f014020f9f0d3ecf8c5095
font_01_sfnt_off0000f568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF568 10372 bytes
SHA-256: 44abf9e0038fbf607a664b902931ebe3d97083826acbb56570832665902b7363

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