Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b1773ca2418566…

MALICIOUS

PDF

71.4 KB Created: 2021-01-24 23:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a5fc16ac396210cf4a4073993323ad2f SHA-1: ac5282ea44f8ef093f3b3922e67fd70d42e591d5 SHA-256: 31b1773ca24185661e27c3e66d03e77407cd8f6107a50f9e24b02cd65097485b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://trafficel.ru/123?utm_term=aiken+house+and+gardens+winter PDF link annotation
    • https://pagafamowadaf.weebly.com/uploads/1/3/4/8/134878907/kegabalowilupud.pdfIn PDF document text
    • https://ranazujip.weebly.com/uploads/1/3/5/3/135398887/futapitogobo.pdfIn PDF document text
    • https://xexalidifiso.weebly.com/uploads/1/3/4/6/134685587/4071790.pdfIn PDF document text
    • https://cdn.sqhk.co/kokuxisa/0ifigjb/vagezidupazavoporirato.pdfIn PDF document text
    • https://sovomebidug.weebly.com/uploads/1/3/1/3/131379042/362231.pdfIn PDF document text
    • http://logvoz.ru/59367181344m9vh5.pdfIn PDF document text
    • https://cdn.sqhk.co/kopuzeginev/Egik98y/fun_brain_training_games_online_free.pdfIn PDF document text
    • https://cdn.sqhk.co/novimabe/fpB59Ps/red_ball_4_volume_2_level_10.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/272e4b.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/3605543.pdfIn PDF document text
    • http://idealsit.space/tefukameruvata8n.pdfIn PDF document text
    • http://mscgis.net/9355277116198ebn.pdfIn PDF document text
    • https://tepikibinaf.weebly.com/uploads/1/3/2/3/132303010/votivalujujenarope.pdfIn PDF document text
    • https://foxenaduro.weebly.com/uploads/1/3/1/1/131164157/e9c39c612d4456a.pdfIn PDF document text
    • https://borojixupoluba.weebly.com/uploads/1/3/5/3/135316148/vebow_letodejuj.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/juzinaramip/marvel_future_fight_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/towuxaju.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/lethbridge_police_incident_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/kujapekokomikozipu.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

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_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 5200 bytes
SHA-256: a2cf24a518cf97885dc084ac8ccf2a2f209aef78e7c13095f577ac658f381d28
font_01_sfnt_off0000eec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC8 9652 bytes
SHA-256: b7abc5b6bcfaa1358a5c293707f4ca452bf4fb765c9adfd6176fc0cd17bdcd99

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