Malicious PDF — malware analysis report

Static analysis result for SHA-256 a197cb8f27388176…

MALICIOUS

PDF

72.3 KB Created: 2021-01-05 04:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d54beb86e713d522a0aded217a8d04b3 SHA-1: 9365b8f058247b2a323874e8d5c0a44db1e444d3 SHA-256: a197cb8f273881764a762c4f8cc6efc3a56f3292dc1fe27d60e099fe7a3955b1
214 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing lure, evidenced by the high number of embedded links pointing to redirector infrastructure and potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to lead the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/aws?utm_term=accelerated+reader+book+answers+quizlet In PDF document text
    • https://cdn.sqhk.co/waxipefimafa/1Rpen5v/rizijiroboloda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476947/normal_5fb2ffc1daa47.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5fc920041ecf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f9f82c9a3a50.pdfIn PDF document text
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/474241.pdfIn PDF document text
    • https://cdn.sqhk.co/ratugetaj/3XZgdRY/rock_and_roll_christmas_music_youtube.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445735/normal_5fe20c1ad1c6b.pdfIn PDF document text
    • https://rudixesawemes.weebly.com/uploads/1/3/1/1/131163949/lidesokimokal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_5fa29914d0e5a.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/6gchijV/jafosowupuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466413/normal_5fdacd386eb88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d5b3ce-19de-4215-815b-e9f0094e0701/zofuriloguti.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_off0000dfdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDC 5392 bytes
SHA-256: 1f1127c80c3d2ca8f335582674833dbec7c5e9f49b91ffd068bac153d7f68d60
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 10124 bytes
SHA-256: a797511e6b84ae35d7c928e97c2b6bf8568d202e72c922b04a83c84ac917124d

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