Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a74008e4b943808…

MALICIOUS

PDF

64.3 KB Created: 2020-11-29 14:04:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c80843745c8de17ddc91176301c5bd41 SHA-1: b61b07f9adfd2e56624ccc4cb81bb58ae2a3c324 SHA-256: 3a74008e4b943808063ceca60e4f3385b7cac6599d0b67437064bad750b15254
196 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, with a prominent one leading to a redirector URL. This suggests a phishing or scam campaign aiming to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=associate+android+developer+indonesia PDF link annotation
    • https://kufofena.weebly.com/uploads/1/3/4/5/134504524/a3fb0d.pdfIn PDF document text
    • https://wudopivuvev.weebly.com/uploads/1/3/4/7/134752163/1485569.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/9432223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492900/normal_5faf5e036c456.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/dazemi/fetobixewoxamomanizelibi.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/349852415.pdfIn PDF document text
    • https://s3.amazonaws.com/wifozuxeku/swtor_vanguard_tank.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/70172581698.pdfIn PDF document text
    • https://s3.amazonaws.com/jezobasit/76020153306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c325fcdd-e6c8-4695-9bbb-da76a44c8716/64791984362.pdfIn PDF document text
    • https://s3.amazonaws.com/povelenavuviw/angular_2_formarray_remove_all.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_off0000c072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC072 5116 bytes
SHA-256: a9c4e6f11e3df9b56d65207042b8dc48d1c9fc4963a9453f6e6f69f80bd15e11
font_01_sfnt_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 10240 bytes
SHA-256: ae697da3af6d255a12774f3752bd6b9f8ae9881a76a1ddb8cc390f1fa0951607

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