Malicious PDF — malware analysis report

Static analysis result for SHA-256 318a1f73ef7d5b3f…

MALICIOUS

PDF

73.5 KB Created: 2020-11-21 23:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 86fb29bfd63f2bf184afc6f3a21df1f3 SHA-1: e9454b1a65713e87a61f4fceb19b8cc87ea09f5e SHA-256: 318a1f73ef7d5b3f066734aed7110457e18d5801f1f41052d3f800757a50d675
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains multiple external links, with one prominent link identified as an SEO redirector likely used for phishing or malware distribution. The presence of embedded URLs and the overall structure suggest an attempt to trick users into visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=domestic+sewing+machine+model+1366 PDF link annotation
    • https://zokunokakepano.weebly.com/uploads/1/3/4/3/134353677/wakulanuvukokip_kiloniloligub_wojixoweberobi_lanemuxawak.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/gajuziz_kakevet_nosovib_laruwusabiva.pdfIn PDF document text
    • https://togimapobeno.weebly.com/uploads/1/3/4/6/134649298/bebasoroligolelizo.pdfIn PDF document text
    • https://fategebedabeno.weebly.com/uploads/1/3/4/7/134718848/3c840056.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/d0fc9da3-38d4-4a99-ab93-88f967dfa191/puzoluda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe6e0a22-a732-4acb-a60d-5f6627562eba/92040846749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e6a90af-4bbc-4aea-a571-9017efa4af8f/87425687426.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f62ec481-02a2-48cb-a45d-f577979370b1/62381877634.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f69e61dc-b947-427c-9ad8-2e6eae9f6e36/59073034585.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1789844-dbef-4583-97a5-4cacdc84dfd2/identities_in_algebra_class_9_worksh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d6321c9-866f-4978-a0a8-d3381d1dd26f/tipunap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb2c600-9f54-4236-aa25-0312fab877a0/365_questions_journal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33bbdc6-8b2d-412f-8f78-a4953c17dd9c/bopirim.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/pidorovopizuwajire.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 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F6 5720 bytes
SHA-256: ad6ce8569e4f3c5801111fba39221dfddbde64ec02665e4dd80457c158a60a8d
font_01_sfnt_off0000f564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF564 10676 bytes
SHA-256: 161b54ebf53516502316b744402e44fae978528cea1703670afeae1ff2b83c07

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