Malicious PDF — malware analysis report

Static analysis result for SHA-256 873e08ac3dce061a…

MALICIOUS

PDF

69.0 KB Created: 2020-11-17 18:18:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 395eeca5b35f932148153b8f6ecad7fb SHA-1: 1169617d0996283ec935c9cb2836aa29f34f755f SHA-256: 873e08ac3dce061a8994a3039760418be08d18400b06f4ecb81706ff2aa9a158
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/strik?utm_term=the+fighting+ground+lesson+plan PDF link annotation
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/6386297.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480170/normal_5faad16aafafb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393362/normal_5f8fb7378c91b.pdfIn PDF document text
    • https://malebikixolu.weebly.com/uploads/1/3/4/3/134358595/kuxigopisixilodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_5fae9447b18c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_5fb3060f4e36d.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/mozedijiz/the_dreams_hollywood_movie_tamil_dubbed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6434305-1c76-4ef3-bd11-6c68e7640695/69625516624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7afc2a2d-58f6-44ae-b12c-1f80b93d343e/mining_levelling_guide_ffxiv.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/reading_worksheets_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d07ecc6-dc7e-4fc1-b0ae-027177ba992c/wuturaguzi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a389527-137f-413e-ab76-7616f8f29dde/active_and_passive_voice_worksheets_for_high_school.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_off0000d1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A9 5252 bytes
SHA-256: 643be15c73d81e2d0def74bb805a5520cac7f7d0810696fb7dfc36d818b435b0
font_01_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 10488 bytes
SHA-256: bea12eb6f5ff152225052619a4acce91c2a21ef1d4781019371497a35a7e63c6

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