Malicious PDF — malware analysis report

Static analysis result for SHA-256 6045632d3fa00856…

MALICIOUS

PDF

74.5 KB Created: 2021-03-30 01:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b40a5f7b176bfcd9df5fb556c32b1201 SHA-1: dd6939aace5b4c3ea7634c7bd4ea9c0bfe7f4cc5 SHA-256: 6045632d3fa008566d6340d162fe7eef5b7f30545a5094282f022de21c000c09
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=bowflex+m5+trainer+for+sale+used
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/4334937.pdf
    • https://cdn.sqhk.co/sozovifena/ilu3g8P/escape_room_level_220_answer_key.pdf
    • https://jolidezebixisu.weebly.com/uploads/1/3/3/9/133997790/bc3a2.pdf
    • https://pazarufawituxib.weebly.com/uploads/1/3/4/0/134000032/dasaduluzape_jusumajexi_lufazedaber.pdf
    • https://jolibudowuw.weebly.com/uploads/1/3/4/5/134596284/99807.pdf
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/9855486.pdf
    • https://cdn.sqhk.co/kubepugemaki/gckYjfX/ice_cream_easy_lyrics_bp.pdf
    • https://cdn.sqhk.co/nedupugifuka/kij89hj/instrumental_beats_2019_download.pdf
    • https://cdn.sqhk.co/wepurodapike/jboiipC/46719133319.pdf
    • https://cdn.sqhk.co/tejosepu/agfgijd/75293826822.pdf
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/sebiganititoka_tadabozutekarip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d6c78911-98ee-49c9-ab54-f182f7942951/86288869612.pdf
    • https://s3.amazonaws.com/jeromopelurab/worksheets_about_demonstrative_pronouns.pdf
    • https://s3.amazonaws.com/remuv/84902150681.pdf
    • https://uploads.strikinglycdn.com/files/a047b94e-9c7d-4c2b-93f6-62890dd75a99/the_7_habits_of_highly_successful_financial_planners.pdf
    • https://uploads.strikinglycdn.com/files/1cc7112f-be81-40d8-b64d-e6b511a064ae/fevop.pdf
    • https://uploads.strikinglycdn.com/files/583da744-fe52-44b1-94af-880f62bf7818/pillars_of_the_earth_book_3_achievements.pdf
    • https://uploads.strikinglycdn.com/files/fd52f0e2-ba99-4501-879b-f264cea45849/sovepeka.pdf
    • https://s3.amazonaws.com/jeworurowam/latte_art_tutorial.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5af.bin
26923cf9b260621654589f84945f175298e354765f2b1a8dc8bfa28352f17ac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AF 5388 bytes
font_01_sfnt_off0000f806.bin
b057e85faad2b632d39ea032363d970436931aa5b5cca94c2e2bd0b713280417		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 10864 bytes

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