Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1e5cf2b4661967…

MALICIOUS

PDF

36.0 KB Created: 2020-06-05 21:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 885fb26a3a1641a3749fcb4c00f6c09c SHA-1: 2a8c703749bb575fce9c12632f45b61a0aaf4473 SHA-256: 1c1e5cf2b46619675beb68b3eaea5ca25f10a4f78e2d59701e867bdde999e430
136 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, indicating a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' specifically flags this behavior, suggesting the document is designed to drive traffic to these external sites. The presence of URLs like 'http://dg3hu8.salon225.com/uploads/1/3/1/4/131437183/131437183.html#bobcat+service+manual' suggests a lure related to service manuals, which is a common tactic for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dg3hu8.salon225.com/uploads/1/3/1/4/131437183/131437183.html#bobcat+service+manual PDF link annotation
    • http://fourcornerstribalbusinesscorporation.com/uploads/1/3/1/4/131453028/jevuje.pdfIn PDF document text
    • http://acafeend.com/uploads/1/3/0/7/130775707/2836180.pdfIn PDF document text
    • http://hostmaster.cmefitness.com/uploads/1/3/1/1/131163991/lefegizisupanabe.pdfIn PDF document text
    • http://leapsboundsrehab.com/uploads/1/3/1/4/131407567/284121317839b5d.pdfIn PDF document text
    • http://counterpunchtv.net/uploads/1/3/0/7/130739539/30f223d6eacb6.pdfIn PDF document text
    • http://paulalewisot.com/uploads/1/3/1/4/131437976/2446720.pdfIn PDF document text
    • http://dg3hu8.salon225.com/uploads/1/3/1/4/131437183/terms.htmlIn PDF document text
    • http://dg3hu8.salon225.com/uploads/1/3/1/4/131437183/dmca.htmlIn PDF document text
    • http://dg3hu8.salon225.com/uploads/1/3/1/4/131437183/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://lusunum.files.wordpress.com/2020/06/4466643143.pdfIn PDF document text
    • https://wekigosavela.files.wordpress.com/2020/06/19527396629.pdfIn PDF document text
    • https://pukavax.files.wordpress.com/2020/06/28124136615.pdfIn PDF document text
    • https://vorapizogu.files.wordpress.com/2020/06/78165498703.pdfIn PDF document text
    • https://sabaliku.files.wordpress.com/2020/06/39370710668.pdfIn PDF document text
    • https://ruxejetufe.files.wordpress.com/2020/06/lipajuxinevamap.pdfIn PDF document text
    • https://baxepigidumi.files.wordpress.com/2020/06/tekem.pdfIn PDF document text
    • https://forerojapu946186861.files.wordpress.com/2020/06/jabur.pdfIn PDF document text
    • https://sobuvifabi272439949.files.wordpress.com/2020/06/bizubatexepirokojaletumuj.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 2

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_off00005d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D81 11960 bytes
SHA-256: 4281f354cd74f80d3e57cc7b75e5b6219242ad92e8ee9c2f9e1a3187fd61ab29

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