Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b20fec3497d17eb…

MALICIOUS

PDF

67.2 KB Created: 2021-03-08 10:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8e18bfb04f44a5ae0118191ee075716c SHA-1: b2bfc883c7ed7bc5dd40c6de704b0d0bbdd054d0 SHA-256: 6b20fec3497d17ebc624a5deb05333400a368b8b56191daae7ac41c735bfe903
244 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. It also contains a large number of external links, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, and the document body was heavily truncated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/wix?keyword=how+to+survive+2+trophy+guide+psnprofiles In PDF document text
    • http://skidki-day.site/south_african_questions_episode_3mdck5.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/hf29BJp/solarx_insurance_thousand_oaks.pdfIn PDF document text
    • http://nesobaka7.xyz/36449381625utkt9.pdfIn PDF document text
    • http://sweetmeet.online/kowagilejn8xq.pdfIn PDF document text
    • https://cdn.sqhk.co/felinavaw/cgigdhg/todibefubabeko.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/6CALMji/fuvujovojiribokaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_6268d5eabf184316948eee3201c0f0b7.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_2a9225041ce04347af56ad0b3f4e0ce8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b732e52-e17c-4f4a-83e5-91accf92ffa3/romeo_juliet_cigars_churchill.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/bed_sheets_sale_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e01fd288-4272-4f3c-9a3d-117c49fbfcbf/15323084753.pdfIn PDF document text
    • https://76f5a3e5-08d8-4581-9975-6c1b933a1845.filesusr.com/ugd/dbbd16_857b30582b1749e2ba2e7da9d6f27236.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_7b4757d4780c4abab35709801eeee6a8.pdf?index=trueIn PDF document text
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_3acdbf7e72ca48a59b8996a26637f64b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9be42e60-019a-404c-b09b-6aa4025ac11b/will_height_affect_gravity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/144d38d8-8d3a-40de-a3e2-98795a439710/7652492222.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_2ea3495890094e2b98cb65c5aaa1cf51.pdf?index=trueIn PDF document text
    • https://1416a32c-f91c-4ec3-9c10-bfdf610c7df7.filesusr.com/ugd/76de1a_d7a24dde0f3c4fc28e39b7ae25a7ba4c.pdf?index=trueIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_a80fb160d0ee4080996869fa41463ec5.pdf?index=trueIn PDF document text
    • https://2f8a6ab9-e864-4757-b083-6627a13f4c48.filesusr.com/ugd/405339_c656586b00ce4b419d4e133735404a2b.pdf?index=trueIn PDF document text
    • https://460eb545-5389-4aa9-9e78-d1074a8bca0c.filesusr.com/ugd/21a131_8c75ef3419b84ba9a2cc85f37beaddd2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saxefi/texebagukevixinif.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_off0000ca27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA27 5440 bytes
SHA-256: f5a40ae88628c6a76c3d9802e966d01644aa48c76fcde0a38a51607e9c274178
font_01_sfnt_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 10108 bytes
SHA-256: c8be5454a8577db9838cd72997e1177dcb4b9c794e1f7841e46e8060c072f67b

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