Malicious PDF — malware analysis report

Static analysis result for SHA-256 37430e6a0ae5381d…

MALICIOUS

PDF

69.5 KB Created: 2020-11-25 19:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 6b09640b987a0afdc98b4563bc38b4f9 SHA-1: 21dc7076a5e0a9eabbd8ef0d94aec9dd976a85d3 SHA-256: 37430e6a0ae5381dc8c83f4a0b53fe5006dd4603427fb144fbdfa965422dc32d
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK, indicating it's part of a link farm or phishing scheme. The presence of an external URI pointing to 'trafffi.ru' with UTM parameters suggests a redirection to a malicious site. ClamAV also detected it as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=american+4-4-0+general PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5fbb761514162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_5f8d7b8fcc323.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412999/normal_5f975496495cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5faa1c41c4a97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365613/normal_5f871e595312a.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/tefamejuvimu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/henghuili-files2/78659592324.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/present_tense_with_future_meaning_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/castello_di_amorosa_guided_tour_review.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/71026835930.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/72907005590.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/f._r._h._s_full_form.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 3

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 4788 bytes
SHA-256: 5d51dd1b09f5d9eeb6344659309bac545319d6bb89cf9be3ebe62ed3f08d62ea
font_01_sfnt_off0000d91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91D 9968 bytes
SHA-256: 2b6fb5a1f0e490135189d7fe212bab39f3db657f8e98c5a16d9df6050ee98ac5
font_02_sfnt_off0000fb30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB30 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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