Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4008f934478265…

MALICIOUS

PDF

66.9 KB Created: 2020-12-15 03:53:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d2b3354d1de2112039bb0673569453e1 SHA-1: b8e734d894cb7924e7b920fc5921ba0559369aff SHA-256: 9d4008f934478265d50566cbff324c35ba063cf91d76213553b688a679ed35f3
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating a mass external PDF link farm, with one prominent URL pointing to a site that appears to be related to password changes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to trick users into visiting a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/123?utm_term=how+to+change+password+on+sentry+safe PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377100/normal_5fa95016cf948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_5f9a49c1d2ccb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492259/normal_5fd07acd3f087.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/nixitegilamije.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/d0aabbde-c01a-4c5b-832b-657fca3131c9/65124627835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4de73c99-35f9-4cd5-b5d6-3e7ecbd9c0a0/97331054437.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2856f24b06a7eb3098ecb/t/5fc55506f81c9a2a0c544fbc/1606767879158/womopugagawavu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc07dde27a199023ab34438/t/5fc0e242cb3e0f5771701560/1606476358095/el_cerrito_recycling_center.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6896f41a-0d79-4d10-86ce-374121457203/53042162131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17091980-82d5-475e-a20d-a5e296ec5087/why_is_trump_orange.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/164c4bee-09a5-4c89-9d20-4cc974145ca5/minot_state_football.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda47c45-3ae4-49cc-8e5c-03832d661573/pukerutadut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd877bcd-cbdc-44c2-b66b-b02c61437386/14265818994.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_off0000c82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 5540 bytes
SHA-256: 189cde370145f4c5d800608681288f2e659ece5ebd1c43dd0611236a1f4aab4c
font_01_sfnt_off0000db1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1D 10388 bytes
SHA-256: 8b3169d4ba8e732380e2895ac477dfe00d1f220ba747ac59f8d10bebfd0e88a0

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