Malicious PDF — malware analysis report

Static analysis result for SHA-256 72968b780a495bff…

MALICIOUS

PDF

40.3 KB Created: 2020-11-06 23:59:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f140aaef72f4bab258667962ac7837c4 SHA-1: 9c687a125d283d904806c3ec779e14d590818c1c SHA-256: 72968b780a495bff6ca559cd45a90af71522ee43d673c7044d806f447b074166
136 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to what appears to be an SEO link farm, suggesting a phishing or scam campaign. The document body text is obfuscated and contains a URL that is likely the primary lure. The ML classifier strongly indicates maliciousness, and the presence of multiple external links supports a malicious intent.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://trafffe.ru/123?keyword=what+is+the+parent+function+of+a+graph PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5f9dc1c3d26de.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/raradedarabozukeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f96bb4cde174.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/9692696.pdfIn PDF document text
    • https://nabolonoroxene.weebly.com/uploads/1/3/4/3/134373159/bulixu.pdfIn PDF document text
    • https://papazutizo.weebly.com/uploads/1/3/4/4/134467207/pelugusefub.pdfIn PDF document text
    • https://dowamiwimeguv.weebly.com/uploads/1/3/0/7/130775936/worelibisedelog.pdfIn PDF document text
    • https://nulomofog.weebly.com/uploads/1/3/4/3/134331556/webofokajag.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/18b0c.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/xipavir/79081628285.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/kilumime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba9b0a0-fc22-46ec-a377-8162f8670fef/fofagaxotegenawowimapevag.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/bilifoda.pdfIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/74941552516.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ED8 5260 bytes
SHA-256: c309fa5c0e0447335f4a96be7d60f246278ed4ffa347024b7c1af8d3cb3e18e2
font_01_sfnt_off000070c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70C9 10376 bytes
SHA-256: 29475da2ad756c9a55fd194a76be0c20631c167efe1b1dbda177a4051aaf6ec6