Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a0909a840467a23…

MALICIOUS

PDF

74.1 KB Created: 2020-12-25 12:20:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7129d2cba7973ed27402512384f586ae SHA-1: 19b153f866cd7e75c640ec6e43ba6a8763fe22a2 SHA-256: 2a0909a840467a23663832a3ea9157c83ac9f9473c1c0cb26da225b1af05184d
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, and also links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests the document's primary purpose is to redirect users to potentially harmful websites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/strik?utm_term=zodiac+signs+facts In PDF document text
    • https://cdn.sqhk.co/dubezaxuviz/RNQHu3M/26253148193.pdfIn PDF document text
    • https://cdn.sqhk.co/bepasasa/rHjh1CS/34311483168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_5f9b64f1ba851.pdfIn PDF document text
    • https://cdn.sqhk.co/doxinotilid/FgicUqH/samsung_phone_grand_prime_price_in_pakistan.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/cDZxhiQ/73357625790.pdfIn PDF document text
    • https://cdn.sqhk.co/fijajiles/hh82P3Y/sanevilixuzatabikesoru.pdfIn PDF document text
    • https://niwejeru.weebly.com/uploads/1/3/4/3/134308800/nixitegilamije.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/NggwJpT/line_runner_2.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/bUgihb3/server_stats_bot_discord_invite.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/webopokopa.pdfIn PDF document text
    • https://vijilipaguwojig.weebly.com/uploads/1/3/4/8/134872157/d3c51f.pdfIn PDF document text
    • https://cdn.sqhk.co/zivugeri/hdPpjbk/snowball_fight_winter_snow_battle_action_games.pdfIn PDF document text
    • https://cdn.sqhk.co/daboxazile/gei0Oih/93197877235.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380068/normal_5fbb185806ec6.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/roware/excel_vba_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/duvarobujo.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_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 5020 bytes
SHA-256: 20c0cc14f4439c148baeebff8b7c9420626f0133d7858d525776b785d3a2f20e
font_01_sfnt_off0000f882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF882 10216 bytes
SHA-256: 524253ee7e58251bd2654fd7b484913231364c8ae44b3077114b642bbc9e1b65

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