Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7516036c5f791c4…

MALICIOUS

PDF

72.4 KB Created: 2021-01-01 00:16:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 46594912f7226f3f95f8128b8d5f355a SHA-1: c56af3fdbd6b42c7ea1d3ca9d2ccb31683e225e8 SHA-256: c7516036c5f791c476f3cd1bcf844724d824f3963b25ec63af8cec17ca3a85b5
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, specifically identified as a malicious redirector and an SEO link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are designed to lead the user to a malicious site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffmen.ru/strik?utm_term=flow+depression+app+review In PDF document text
    • https://cdn.sqhk.co/femuzetoj/jbBhfic/48593458140.pdfIn PDF document text
    • https://gijowazav.weebly.com/uploads/1/3/4/0/134097260/a5f1dad1f1a.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/b6b55f52-5c92-4d59-8604-d13f3ddf2e95/46255326257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08d5f344-98ea-400c-a5eb-3cefc51f54a7/sasenizaxolizowufe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c221c069-7357-452b-b929-c3d631a93011/67924012901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/129dae63-8e0f-4477-9e99-388976f3088f/belleville_district_118_job_openings.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/7515453233.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11faf643-93d8-4769-9d65-19e27f445010/sowokajuzusatasit.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/25632926384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d61a581-e7a7-4669-aa17-a25e724dcb10/99396473242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64922fce-dc0b-4651-b812-ef27fb1795b5/gunagozamatavavewuburapi.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/potato_chip_slicer_bed_bath_and_beyond.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_off0000df1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1F 5060 bytes
SHA-256: 2ff7958bcdedfa702ae33435a3ad8eb4035773cc9335e75752bf92f2bcd0c2f0
font_01_sfnt_off0000f07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07A 10804 bytes
SHA-256: 33b5eb8926d5e41bdd65d8707f3a09db73a3cd736d7840ffabc22ae4c5dbd46e

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