Malicious PDF — malware analysis report

Static analysis result for SHA-256 93867d35e9ed9e8c…

MALICIOUS

PDF

70.4 KB Created: 2020-12-17 21:39:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8b380c00803a63115c34bad472255aaf SHA-1: 9ffcbdfe6e3d43cd2f1891db298ce5d6bac640d2 SHA-256: 93867d35e9ed9e8c083f9c9cf47230a3740a9a212dc5111fb05f0369720670af
254 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, including one pointing to a known malicious redirector (traffine.ru) and another to a link farm (petabururumeje.weebly.com). Heuristics indicate the document is a malicious redirector and part of an SEO link farm, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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
  • 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/123?utm_term=dating+definition+sociology In PDF document text
    • https://petabururumeje.weebly.com/uploads/1/3/4/9/134902787/a16574.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f883b7cd3c4e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fcc55ab47580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466173/normal_5fa9b2bd26e32.pdfIn PDF document text
    • https://lavupujewefi.weebly.com/uploads/1/3/4/6/134631736/3916611.pdfIn PDF document text
    • https://vivorewipaxuje.weebly.com/uploads/1/3/4/3/134365477/lutimavafi.pdfIn PDF document text
    • https://biwewijusegi.weebly.com/uploads/1/3/4/5/134586848/wexivono.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/a90707d1-2adb-45a6-916e-5ff5d2995bed/mirika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba27144-1f96-4cfd-9586-7a64e6ab57ff/79545274479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c326abf-1e5c-4c0b-ab5d-77e2e5b968d0/29818118143.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee29c0ff-b31a-4961-9e98-cd239611e3e4/puvivegiwiladidatumot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb945df-da5e-4600-8b5c-f6efb069deac/can_you_refreeze_shrimp_once_its_been_thawed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aee9b25e-29c9-4cd1-ae52-6e5e4469ca9d/8049315826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87873db7-ee76-45f5-b2e9-0883cfa555be/jazojapilimumevav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8be2764e-169c-4306-9928-4eeae4d7c08c/mile_a_minute_vine_flower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7f2356-975d-4fa0-bdff-d82125535ea1/theories_of_the_policy_process_westview_press.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 5196 bytes
SHA-256: 3b9db954c0b6ec1654fe49aede7e694dbedcaefade6617699d21572472b8d4f0
font_01_sfnt_off0000e92b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92B 10288 bytes
SHA-256: e18f124789b14b42e1dd756325acd0b7a29f9e1d12693e3e38d3a20e2b08235c