Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f801de6c1b10a16…

MALICIOUS

PDF

88.9 KB Created: 2020-11-10 16:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 078957d98b710542e90e11b62b7bf072 SHA-1: 5d0ed9c91666d26d91e24b7829358fba705c7022 SHA-256: 8f801de6c1b10a1688c8f4d5e0b84c68dbdab91fe9357ffdec4e5f96426a12c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, including a link farm heuristic, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URL and the presence of a link farm point towards a phishing or malware distribution scheme, likely using the document's content as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?keyword=potato+salad+dressing+recipe+with+egg
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f943921d3e25.pdf
    • https://cdn-cms.f-static.net/uploads/4424347/normal_5f978fa367da2.pdf
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5f9fe3682b83f.pdf
    • https://cdn-cms.f-static.net/uploads/4421205/normal_5fa0002748098.pdf
    • https://bavejojonosepes.weebly.com/uploads/1/3/1/3/131380601/nazibipedan.pdf
    • https://cdn-cms.f-static.net/uploads/4369165/normal_5f892b2548dcf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fejatepudopito/fsc_biology_book_1_chapter_11.pdf
    • https://uploads.strikinglycdn.com/files/be7f445f-1b92-4829-a3bf-251b94253590/four_winns_268_manual.pdf
    • https://uploads.strikinglycdn.com/files/0c56b7a9-290b-417c-b663-4ead0369d1cb/does_vimax_pills_really_work.pdf
    • https://uploads.strikinglycdn.com/files/fbb22556-d9c4-401b-861b-b269c1494a98/xanilepimeru.pdf
    • https://uploads.strikinglycdn.com/files/35a67ba5-28bd-46c3-95dd-0ac2b97473f5/zazimijina.pdf
    • https://uploads.strikinglycdn.com/files/59c92657-6317-4ebf-9666-4ade95f19d72/33161074194.pdf
    • https://s3.amazonaws.com/ruzumeb/80661293756.pdf
    • https://uploads.strikinglycdn.com/files/56a0d4cb-cce2-4416-b90c-e0819c6b53af/dofezarapejaripefoxamome.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001294f.bin
dc2fc78fab3a6ad48d453da52462780575d73f88f37cabd39f52eb36368a5b0f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1294F 25936 bytes
font_00_sfnt_off0000e8a8.bin
e5482d6707c772c11002bbe30fd4a7d338c215992944041149357efca0b6e142		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A8 5428 bytes
font_01_sfnt_off0000fb23.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB23 1800 bytes
font_02_sfnt_off000103b1.bin
56252c417ac8910adf375594f8e6350a8ec418267466103731eceb7a7d24b6e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 10960 bytes

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