Malicious PDF — malware analysis report

Static analysis result for SHA-256 31896a6cbb6b2584…

MALICIOUS

PDF

79.3 KB Created: 2020-11-24 09:50:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 56594f32e76ba46e5c8b0301b759104a SHA-1: 58d252a73245d4724acf5fe157d77080412046fd SHA-256: 31896a6cbb6b2584c1077ad19fd0696db64ba008fb2fa34867a9942b1f047633
254 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a malicious redirector and part of an SEO link farm. It links to a known malicious redirector infrastructure, suggesting a phishing or scam attempt. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful content.

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/strik?utm_term=garcinia+cambogia+results+without+exercise In PDF document text
    • https://s3.amazonaws.com/ritoma/gewofamuf.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/6551840868.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/35086091355.pdfIn PDF document text
    • https://kudumegowejo.weebly.com/uploads/1/3/4/2/134266354/xepezaxilisozu.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/acb24ef0-462e-44c0-9f17-1d70aca4dd6e/gauss-jordan_elimination_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3624d685-612b-4787-a744-cfcdf299c791/76940125405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eace156-6ab5-4404-ad21-ed951a99cb44/lugejeluxatesupixofemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1e282fe-a26a-4fd5-a372-deaf961d08a7/plant_vs_zombie_2_mod_apk_2.3.30.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ad4ab35-f622-4afb-9e35-65dc4e424dba/85250798535.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04fab0f5-f382-4bde-9fa7-b60ef969c2fd/4254413521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c38f4a9-e8c8-4824-9910-76314b88f58d/iq_test_free_sample_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22a7eb1-be9a-4356-9050-76a3f7158182/call_of_duty_black_ops_3_walkthrough_youtube.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 5544 bytes
SHA-256: 0014694a45f813ba51e90dd79a54ca7278885b442e63acd654077575772e9bd4
font_01_sfnt_off0000eaf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF2 2148 bytes
SHA-256: c01c871a0a67b776f7ff2189631b2657ce7a3be0e85ff715c524bcce36c90a05
font_02_sfnt_off0000f4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E8 10724 bytes
SHA-256: 8cc0b640b5dd06892fa236b6df7295d4fbbadf086748356c736696ed1555fcf3
font_03_sfnt_off000119d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D6 16164 bytes
SHA-256: 967d89e51290aceb8fea09c2f9e0c707663cecf1a9b826b2128538f448fdbc28