Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63b6ec48e4e2a31…

MALICIOUS

PDF

76.1 KB Created: 2021-05-31 07:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8335c69fc2c1a3e04f7d28ecaa10e2d6 SHA-1: da83acc6322f80a33bc3ff048378147fa085c1e0 SHA-256: f63b6ec48e4e2a31556afe920f3cf9f4a2b8c3f24a831a91d2c4502191b6abd7
156 Risk Score

Malware Insights

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

The PDF file, disguised as a 'Spark plug condition guide', contains numerous external links, a common tactic for distributing malicious content. The heuristic 'PDF_SEO_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the overall structure suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=spark+plug+condition+guide
    • https://soregekewo.weebly.com/uploads/1/3/4/2/134266411/kegesetoxipa.pdf
    • https://cdn-cms.f-static.net/uploads/4415739/normal_601bf98b7d95e.pdf
    • https://cdn-cms.f-static.net/uploads/4423443/normal_603bd67ac2968.pdf
    • https://jurogewogil.weebly.com/uploads/1/3/4/3/134318518/2590592.pdf
    • https://zufinoresazoso.weebly.com/uploads/1/3/4/7/134711963/kitinav.pdf
    • https://cdn-cms.f-static.net/uploads/4382407/normal_60451423e6b45.pdf
    • https://tojipojewusaw.weebly.com/uploads/1/3/0/8/130814735/0b28a2ec14.pdf
    • https://cdn-cms.f-static.net/uploads/4482853/normal_603e331d398eb.pdf
    • https://cdn-cms.f-static.net/uploads/4480403/normal_60619684110e3.pdf
    • https://cdn-cms.f-static.net/uploads/4474218/normal_60607b5abe7bb.pdf
    • https://misekijenag.weebly.com/uploads/1/3/1/3/131380320/6107192.pdf
    • https://judorobizud.weebly.com/uploads/1/3/4/4/134455398/834f43839.pdf
    • https://static.s123-cdn-static-d.com/uploads/4411918/normal_60b4049aec279.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6a4652d3-0497-4265-808f-888a58a2ee87/how_to_open_hp_elite_8300.pdf
    • https://uploads.strikinglycdn.com/files/a031136a-c62d-4f80-8b2f-80617fdcf9ce/dananumanirudufuxirakovop.pdf
    • https://uploads.strikinglycdn.com/files/f3cbacf0-4fff-46d3-b935-3befe211632e/nitiduwixebilijex.pdf
    • https://uploads.strikinglycdn.com/files/ed8a59bc-88df-49bd-92d5-7da0400cd919/takideba.pdf
    • https://uploads.strikinglycdn.com/files/5c8fa415-5472-4781-9370-faa7f7191a81/exercice_figure_de_style_3me_avec_correction.pdf
    • https://uploads.strikinglycdn.com/files/be49a452-78fd-4639-b0dd-2c61767eab2c/66367274349.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9a.bin
e8e031ab0550ab6548cf223ad2fe40fee7c59a21785c6c9793b50a077a08246b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 5232 bytes
font_01_sfnt_off00010078.bin
51a8cfb9326fc9b0149194fefbc8dc6a60460679fd180c462fda10622768148b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10078 10236 bytes

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