Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb69a0efc7bd426f…

MALICIOUS

PDF

82.9 KB Created: 2021-03-02 09:35:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: ed071bd248ed4090eefcfeb66c360a0a SHA-1: 2e9c4f38e93e0dc66be2bd1ffb925c7c52b4bbb6 SHA-256: bb69a0efc7bd426f9119b5f124411a4578a1722925311f34b0d38f5ec8400331
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is `https://druttle.ru/strik?utm_term=what+psat+score+do+you+need+to+qualify+for+national+merit`. This pattern suggests a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://druttle.ru/strik?utm_term=what+psat+score+do+you+need+to+qualify+for+national+merit PDF link annotation
    • https://geruzusuvar.weebly.com/uploads/1/3/0/7/130776720/dfb58919cc54ce.pdfIn PDF document text
    • http://freefire-gifts.com/clinical_biochemistry_case_studies_with_answersdfcfp.pdfIn PDF document text
    • https://wixetaduzem.weebly.com/uploads/1/3/4/4/134471786/5389955.pdfIn PDF document text
    • http://legalvictory.group/42032034315csr3u.pdfIn PDF document text
    • http://hayatevesigar.online/gutivepesidipadurava9wwzi.pdfIn PDF document text
    • https://wevobuge.weebly.com/uploads/1/3/5/9/135978380/dodeseso_kopebibije.pdfIn PDF document text
    • http://domastmsk.space/37150491369jfxid.pdfIn PDF document text
    • http://ighelperscenter.com/864528152404jjg6.pdfIn PDF document text
    • http://kartaidatodemeleri.com/mini_3d_magic_maze_puzzle_ball9jzc6.pdfIn PDF document text
    • https://gitokivoj.weebly.com/uploads/1/3/4/3/134316846/7539770.pdfIn PDF document text
    • http://fringigejy.site/20337550969ku6k.pdfIn PDF document text
    • http://scoretdho.best/4136733571mux9b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://nejimafalun.onlinewebshop.net/dufusuzovixevaxuzo.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/gukovolajuzevoxesubikavuk.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/mufolijuvovutumomateku.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/zavomezewujugi.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/glen_ellyn_park_district_activity_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f65b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65B 5516 bytes
SHA-256: 8576905ecc116e8f3f87b4c690f2de27c8aa33b7eb87797836a8dc40f9dffb9f
font_01_sfnt_off000108f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F7 11412 bytes
SHA-256: 3172c677a8f2fceca9d8c207ef502f631bb30f4c4a8d27f40c1a20c1ff66e1a7
font_02_sfnt_off00012fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEA 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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