Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1142cad7c1af04…

MALICIOUS

PDF

91.8 KB Created: 2020-12-23 01:22:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 19a65e09183c6f9702b2f69b65a272fd SHA-1: 807ade1fdc5b067ac8d8d60ab25745ecb3c64742 SHA-256: 4a1142cad7c1af04956cf4c7cf254cb8b583f0c00386c8962da7eb4c9838521a
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains numerous links, including one pointing to a known malicious redirector at `https://traffine.ru/aws?utm_term=blockchain+explained+pdf`, which is likely used to distribute further malicious content. The document body, though heavily obfuscated, suggests a lure related to 'blockchain explained pdf'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/aws?utm_term=blockchain+explained+pdf In PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/sopesup.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/guwutivupudutu/tawosafudoroxilunupesikut.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/48593033786.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/active_and_passive_voice_definition_and_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/5597305792.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf5f7e3f75b16643ccbcc1/1606377343087/65581645061.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc67f67ab79f442f2500a09/t/5fcadda136758319a54747e5/1607130538977/zimumunukukawojusid.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/7214776389.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd228261-f8ac-42ae-8b35-349bf5cf428c/effet_vitesse_png.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/vidya_vox_kuthu_fire_mp4.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 5148 bytes
SHA-256: 37b792fd4fae3c892858a75afd337bd2ed4457e31913786b0e8c6a73cd0dcd6a
font_01_sfnt_off000141a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A6 9624 bytes
SHA-256: da1d7ccb05a58f411a05b313a86f69d128cea00b8da18d381ec110cd3edf1252

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