Malicious PDF — malware analysis report

Static analysis result for SHA-256 5493b197a4570424…

MALICIOUS

PDF

34.9 KB Created: 2020-03-21 21:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: accbafe66452d0df695eed176ac5f5df SHA-1: f4045b1fdb6888e46045f80650832774844fdbd3 SHA-256: 5493b197a45704244c68dac0b1a67f09c475e48882fd3943c8ba80e5008339e0
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to various domains, a technique often used for SEO manipulation or to distribute further malicious content. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this pattern. The ML classifier also strongly indicates maliciousness. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://hyperion-ai.com/uploads/1/3/0/4/130489230/130489230.html#alg+2+sol+formula+sheet PDF link annotation
    • http://millymop.co.uk/uploads/1/3/0/2/130272955/001a5ac814b2f76.pdfIn PDF document text
    • http://mta-sts.penetron.lt/uploads/1/3/0/7/130776315/vevijubif-vukavixanape.pdfIn PDF document text
    • http://nativfitness.net/uploads/1/3/0/2/130288364/5021066.pdfIn PDF document text
    • http://www.plaqueprofessionals.com/uploads/1/3/0/7/130740256/sedijikije.pdfIn PDF document text
    • http://relaxedskincarefacefullbodyservices.com/uploads/1/3/0/7/130775911/pavuzilulenake.pdfIn PDF document text
    • http://www.sharonbrownfitness.com/uploads/1/3/0/5/130588780/6265753.pdfIn PDF document text
    • http://whitewillowvintage.com/uploads/1/3/0/3/130313253/616466.pdfIn PDF document text
    • http://www.blackouttrading.com/uploads/1/3/0/6/130639995/fumoxovobubutelat.pdfIn PDF document text
    • http://novitaconsultoria.com/uploads/1/3/0/4/130489132/xurabi_birudazajoxoxi.pdfIn PDF document text
    • http://globalyouthexpo.com/uploads/1/3/0/8/130813094/limusobudeviner.pdfIn PDF document text
    • http://boutiquebyjes.com/uploads/1/3/0/8/130874668/toruburuza.pdfIn PDF document text
    • http://speakenglishnaturally.me/uploads/1/3/0/2/130272365/tadenovak-vajil-jojapimapu-piles.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

Related samples 4

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_off00006142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6142 7592 bytes
SHA-256: f4b3c8297ea1c269dd2f11b143352ac365d4a0c2ed7df6630b3aa48435c129f3

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