Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b6120364fa6333…

MALICIOUS

PDF

86.2 KB Created: 2020-11-06 01:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: efec51e0aa83a4d2cd05334bcb657021 SHA-1: 2f81fccb96ed8678eeffa4d8384f4f0312be9e23 SHA-256: 34b6120364fa63339f79d5ddb91e94b46665f66df390a6b7054e8afd11860f7b
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF files, suggesting a link farm or spam campaign. The primary lure URL, 'https://traffset.ru/123?keyword=variance+formula+standard+deviation', is presented as a resource for statistical formulas, likely to attract unsuspecting users. The ML classifier strongly indicates maliciousness, and the PDF structure with mass external links aligns with tactics used for phishing or driving traffic to malicious sites.

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.
  • 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://traffset.ru/123?keyword=variance+formula+standard+deviation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374181/normal_5f8a131859082.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385216/normal_5f9967c1b1801.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_5fa47ccabbfc7.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/3383612.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_5f8be71c820a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451365/normal_5fa3c84290b88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b350c95f-b3fb-4ae3-860c-53daac815c5f/25816635153.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9ce35ce-7b58-4663-8dd6-6fe5287d1a3d/33153421832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8f32f77-0288-462f-af95-1f604f96e114/the_making_of_a_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/moxie_beauty_bar_pickerington_ohio.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 4

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

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3C 2920 bytes
SHA-256: a986119c16e44081cc8e25afede66da4c613bf9b2bda1169c6dfb8b692a7cff1
font_01_sfnt_off0000f495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 5192 bytes
SHA-256: 1c01a2d8fe3f4d6f4fdfe585e99adda5ba8b13856463415f614c6744b557c31b
font_02_sfnt_off00010634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10634 14440 bytes
SHA-256: ff633dd9ad90e71e91257a5476e5fc601748238c08c1e16766b80c649880e7f2
font_03_sfnt_off000135db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135DB 16204 bytes
SHA-256: 9bda8a015a3e881f2d347f2288158abd9b00aa399f60358515dece9a4ab52e72

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