Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c0def71346428c…

MALICIOUS

PDF

27.7 KB Created: 2020-04-28 20:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-04
MD5: afba54f5cb0ea5d8b0e29a860c133132 SHA-1: fa04b224a35211d0be2d196703802e2678542ce6 SHA-256: 58c0def71346428c77da61365fabfca1bd4d6b5761509b3347e1f4232b42389c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites or to distribute further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-9228021-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-9228021-0
  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://shiatsuthaiyogamassage.com/uploads/1/3/0/5/130550836/130550836.html#myers-+briggs+personality+type+indicator+pdf PDF link annotation
    • http://dennistheflash.com/uploads/1/3/0/5/130588240/xisimolikanexaporino.pdfIn PDF document text
    • http://rachellberlinartdesign.com/uploads/1/3/1/4/131438461/9281024d9c017.pdfIn PDF document text
    • http://work-at-night.com/uploads/1/3/0/4/130476248/vevuwuremifutud.pdfIn PDF document text
    • http://doughballexpress.com/uploads/1/3/1/4/131437210/sekibipivigopedor.pdfIn PDF document text
    • http://maiwhy.org/uploads/1/3/0/8/130813325/vobazisotujul.pdfIn PDF document text
    • http://streetsarerunways.com/uploads/1/3/0/6/130621076/neruzaneniwazixe.pdfIn PDF document text
    • http://franckinvest.com/uploads/1/3/0/8/130814601/7105523.pdfIn PDF document text
    • http://holychildcarehome.com/uploads/1/3/0/9/130969116/9899837.pdfIn PDF document text
    • http://activefixtureinstallations.com/uploads/1/3/0/5/130551363/721947.pdfIn PDF document text
    • http://debiarone.com/uploads/1/3/1/4/131407567/84b228bd.pdfIn PDF document text
    • http://curvaceouscoutureweddingdressnh.com/uploads/1/3/1/1/131164308/nidejijewonopek.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
🗂 Part of campaign: dennistheflash.com 3 samples

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A41 5888 bytes
SHA-256: 9a2d56a1e07c1ccf68b70164817c8430aeb314dfb92dffb8ba9665691c4f4793

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