Malicious PDF — malware analysis report

Static analysis result for SHA-256 83fa631e860d937d…

MALICIOUS

PDF

35.2 KB Created: 2020-04-12 12:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 754a7b4644a0f7f5334fd21ac49458fe SHA-1: 8052a404ab9f277ec96d9dc46b7a4d48e3c76b7a SHA-256: 83fa631e860d937d4f75616bc62ac1071c365702585a08c571de51c467153e8a
136 Risk Score

Malware Insights

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

The PDF contains a large number of links to external PDF files, many with algorithmically generated names, indicating a link farm or SEO abuse tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to potentially malicious content or to manipulate search engine results.

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://oftalmolima.org/uploads/1/3/0/7/130740617/130740617.html#thermacell+heated+insoles+wall+charger
    • http://pierogery.com/uploads/1/3/0/3/130323647/sotuxapododapa-xukijozenob-suwapufasigi-tepalutirof.pdf
    • http://bowmanfieldaviationheritagefestival.com/uploads/1/3/0/4/130490117/zulumarifar-noxagiwut-wodifur.pdf
    • http://viajarconconciencia.com/uploads/1/3/0/7/130739116/3592915.pdf
    • http://wuoc2018.com/uploads/1/3/0/9/130969628/tolekasorusovu.pdf
    • http://scw8whedonstudiestv.com/uploads/1/3/0/6/130621450/1730626.pdf
    • http://goneremote.co/uploads/1/3/0/7/130775529/5969832.pdf
    • http://endodonticassociatesbc.com/uploads/1/3/0/2/130289570/1f0faa.pdf
    • http://theredtents.com/uploads/1/3/0/8/130873861/1814803b7f74045.pdf
    • http://cook-edu5.com/uploads/1/3/0/2/130289675/fuzetotowokelu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000640a.bin
44aa3fefb98bb5ff7e1d147764543ea5b314805474cfe0bb6c87b0684f90fea0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x640A 7448 bytes

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