Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64bd2dbc974d842…

MALICIOUS

PDF

72.5 KB Created: 2020-12-11 14:48:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2bab24c57d1eb503d32fc5e0482b2aec SHA-1: 73fc995595069969b6c80a13cff480747caa7992 SHA-256: b64bd2dbc974d8425b67786ddab223f21783e63fff4ab1c8b0163e4983d133f6
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting and are likely part of a link farm. One of the URLs, https://gettraff.ru/strik, is identified as a known malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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/strik?utm_term=an+invisible+thread+laura+schroff In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465398/normal_5fc1f38aa4ded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407997/normal_5fc2747b6f3b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424692/normal_5f9d393c10731.pdfIn PDF document text
    • https://zazetafulunemu.weebly.com/uploads/1/3/4/5/134599809/0a72144bcea.pdfIn PDF document text
    • https://juputifewusa.weebly.com/uploads/1/3/4/4/134435955/9998185.pdfIn PDF document text
    • https://xuzojawuwakobo.weebly.com/uploads/1/3/4/3/134312069/a7fae0e.pdfIn PDF document text
    • https://fovivijidilel.weebly.com/uploads/1/3/4/8/134888041/lopifivemar-xerevizuf-relidisirop.pdfIn PDF document text
    • https://sepenunaxob.weebly.com/uploads/1/3/0/7/130776074/ac845938f56999d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415531/normal_5fa3034bd28dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc13af71c8c7413143404cb/t/5fc5b9333c02f22b9dd2acd6/1606793523353/womens_electric_razor_as_seen_on_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0982a313-b430-41e9-b806-6d4520efd8d9/us_navy_style_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/getizar/seating_chart_for_blumenthal_performing_arts_center.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5112e12facd59cec7c30d/t/5fc6739f9d793648406b8a9c/1606841257995/16110691128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f43a435f-0b49-4406-a46e-778c146000d8/jukewezizakusuvezakege.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_off0000d058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD058 5300 bytes
SHA-256: 3e0530b9a042f6162795eceac610266ade5ff29da40218dbc5904ba61700fdbc
font_01_sfnt_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 4284 bytes
SHA-256: 882b50f9b80fdd2709c4f31d7fd3ca65a6c0bbf6f30b11250016f9c776086872
font_02_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 9928 bytes
SHA-256: b5f8c88abb02fa122b8838c0a4639256fe57c7bce422f29355b4f00abdd6d1fe

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