Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a6527d773d1c9b…

MALICIOUS

PDF

70.8 KB Created: 2021-01-07 02:50:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dafa987c066efb7fe84073baf95a31f6 SHA-1: bb26aa7a361ca30ca6a09d075d10ca3971e64a4c SHA-256: f0a6527d773d1c9b48eafdb274c2597536330765c9d7f1d9abc09a5068acc1de
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest an attempt to redirect users to potentially harmful sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/123?utm_term=nso+nursing+liability+insurance+reviews In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465264/normal_5fb539c817f45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f8cb05650922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420248/normal_5fe7bc249e430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fb2c96940590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_5fab37db5228c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384037/normal_5fbb6cd252994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408853/normal_5fddabed14d6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_5fb80eace79f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5fefb881832b2.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/zetotitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377938/normal_5fbee2b54cd48.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/93f642e8-fcf3-4cbb-81b1-b9ae2509bfa8/59939514468.pdfIn PDF document text
    • https://s3.amazonaws.com/farowug/tiruremep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cdea75d-e447-482a-887c-84981a24e11a/lurirajod.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_off0000d886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD886 5332 bytes
SHA-256: 0b4a5e41b71f225b4a8cc643dcab7f7b68d4ca948172385bcb2ab39ac74201bf
font_01_sfnt_off0000ead8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD8 10204 bytes
SHA-256: de54e432ef27572547c04740946ced7b96a7e42f5a8245ad8c2a8890e71ed0a5

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