Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ffe741c0fe77a8…

MALICIOUS

PDF

78.7 KB Created: 2021-02-13 22:14:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 725285955d5326a471eeb0ac8075b18f SHA-1: 54ffcd09c278fccd4eda0f7126995e24364610f3 SHA-256: a2ffe741c0fe77a8de7d64b9e9623de7c9a1229b2e7dff9b1ba7fa29b6571f27
194 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs, likely to redirect users to phishing or malware distribution sites. The presence of a 'download' button lure further supports a deceptive user interaction pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=new+leaf+strategy+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466153/normal_5fdea3a17d906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_5fe9395e69ecd.pdfIn PDF document text
    • http://dasaburaxad.22web.org/story_whatsapp_status.pdfIn PDF document text
    • https://cdn.sqhk.co/luwivimexu/Yohjgjj/how_long_to_bake_chicken_thighs_and_legs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422893/normal_5fcf3dcf386c2.pdfIn PDF document text
    • https://tifowufiwadoxi.weebly.com/uploads/1/3/4/0/134098290/330447.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/jeVNCVu/advertising_and_marketing_degree_apprenticeships.pdfIn PDF document text
    • https://vutakajar.weebly.com/uploads/1/3/4/8/134896426/7838850.pdfIn PDF document text
    • https://zikawudewodag.weebly.com/uploads/1/3/4/5/134585044/5291882.pdfIn PDF document text
    • https://rigegafotu.weebly.com/uploads/1/3/0/7/130740045/30ff9dc901.pdfIn PDF document text
    • https://saworajopasu.weebly.com/uploads/1/3/0/7/130775294/a99c0ac.pdfIn PDF document text
    • https://cdn.sqhk.co/jovowosifo/gi49Mas/islanders_vs_lightning_prediction_covers.pdfIn PDF document text
    • http://vifijes.22web.org/64733324672.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443357/normal_5fdeb165b5894.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A2 5236 bytes
SHA-256: b2155d43eabe798baabb254dcd621fc056cffd90277d2fcd760835d9c6bdbbd6
font_01_sfnt_off000108a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A7 11400 bytes
SHA-256: 56c0b80e8913691fa6f728aa9967cffeab07f72af5bc111bec48df9b6c885c85

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