Malicious PDF — malware analysis report

Static analysis result for SHA-256 613c5ae779715010…

MALICIOUS

PDF

66.7 KB Created: 2021-02-22 10:09:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 53547421d3ab60dd17f1b1fb7ed86011 SHA-1: cddbfee9a8757eb54ed603da557e617ca7f32421 SHA-256: 613c5ae779715010f915529221556bee3a194d6ee3fc090058e64e8a56259438
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with the file being identified as a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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
  • 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.
  • 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/wix?keyword=decision+2+new+city+hacked+unblocked PDF link annotation
    • https://cdn.sqhk.co/kanemili/iigjjbS/animated_stories_from_the_bible.pdfIn PDF document text
    • https://cdn.sqhk.co/kosojilufut/idojbgg/dragon_lord_follower_skyrim.pdfIn PDF document text
    • https://felinabaf.weebly.com/uploads/1/3/4/3/134380667/lipeziruzog.pdfIn PDF document text
    • https://cdn.sqhk.co/jakufomego/WL3oloc/hockey_monkey_irvine_california.pdfIn PDF document text
    • https://cdn.sqhk.co/luwagoma/gjgIQhe/war_of_kings_game_download_for_pc_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5fd048f60a7f6.pdfIn PDF document text
    • https://jadowusirufire.weebly.com/uploads/1/3/2/7/132740355/gixaxutedas_gukunelijis.pdfIn PDF document text
    • https://cdn.sqhk.co/gupuwiwi/cjb0ih0/22375448647.pdfIn PDF document text
    • https://cdn.sqhk.co/japedovak/YhdxFBR/53885740616.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/jyohiia/fuparagonepibisek.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/wpA4iba/voiceover_accessibility_iphone.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://vuzujalaj.epizy.com/28476447305.pdfIn PDF document text
    • http://jafimelivif.rf.gd/37212480551.pdfIn PDF document text
    • http://jeruzofifisamen.rf.gd/moscow_metro_map_2018.pdfIn PDF document text
    • http://jigabez.epizy.com/39926984952.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_off0000bb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB08 5344 bytes
SHA-256: 786768c74421be3509cd8b665acb295ff8e3935a940a20064ce74be5721fc694
font_01_sfnt_off0000cd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD35 10004 bytes
SHA-256: 1d573fa10cab330f959a87a1b62adaeefdf9940aa3ca3202870d4b167be531dd
font_02_sfnt_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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