Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04018dc6d6901b8…

MALICIOUS

PDF

80.9 KB Created: 2021-03-09 15:03:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c8973429a270b64c12f1895c8799ca03 SHA-1: e92bbd5be15f9f8af3533c627d64bf0fdc13f48e SHA-256: a04018dc6d6901b85761217b22f28b26ca7b1f57bab464de3020a0c35291e522
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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.
  • 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://jottigo.ru/strik?utm_term=rca+surround+sound+receiver+turns+off PDF link annotation
    • http://bestpriceforukraine.xyz/ielts_speaking_part_2_questions_and_answershiy30.pdfIn PDF document text
    • http://vsedlyatebya.xyz/kuch_kuch_hota_hai_mp3_song_free_downloadaa1wl.pdfIn PDF document text
    • https://naridinefe.weebly.com/uploads/1/3/5/9/135959872/8197859.pdfIn PDF document text
    • http://copyrights-notices-helps.com/53429162983ryus.pdfIn PDF document text
    • https://zediruli.weebly.com/uploads/1/3/4/7/134725524/3a2914a11.pdfIn PDF document text
    • http://elinekici.online/dell_u2410f_weightfv1ar.pdfIn PDF document text
    • http://dompodklyuch.com/keppel_corporation_limited_annual_report_20181r3ki.pdfIn PDF document text
    • https://ramakizuwag.weebly.com/uploads/1/3/4/3/134321509/jajumebodogapelopow.pdfIn PDF document text
    • https://dawasaga.weebly.com/uploads/1/3/0/9/130969366/2033453.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_9663707b130042c29df6d3ebf59a43f0.pdf?index=trueIn PDF document text
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_f219a6b5b20a49ae91812f82b5cae369.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/telasebisu/pirokawutefawonesadaba.pdfIn PDF document text
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_ce1b33fa4b8c4efc9c451ec2659dc84b.pdf?index=trueIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_2eca4731709b48838426e736b8f16f71.pdf?index=trueIn PDF document text
    • https://674cbc6f-b08c-4a01-a8c9-516be953d1c9.filesusr.com/ugd/e745be_aa1c582bda5844e7ac523bfceb45cc25.pdf?index=trueIn PDF document text
    • https://f05e0dbb-21cf-40ea-8b71-00b8d6f49a3b.filesusr.com/ugd/b09e1d_ba6b981ed67e498588f5aab9470ab49f.pdf?index=trueIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_0cc32fbce1d04bc9a3122e84eb9ec1b2.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_6f0ab01f403043f89994c11a95548c6d.pdf?index=trueIn PDF document text
    • https://34e223d5-b18a-4f89-96b3-7c58aa965d90.filesusr.com/ugd/440e29_8486b039a04d4df9a185b3bab4e8c869.pdf?index=trueIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_985a9e55f9a042f8a7653b58233fedea.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_1559c5b862b04179958ebf4f36a0b5eb.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_20785312290c4c1caad8edeaba324491.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/salade/miller_s_analogy_test.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/matlab_programming_examples.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_c0804162529e4b1ca819921cdb790552.pdf?index=trueIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_86e52562f6774a1cada5e8c933051d5d.pdf?index=trueIn 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_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 5048 bytes
SHA-256: d295e152d7191d84ebeec8d3ce34884971e804394622a2e34d7f460c358e28cc
font_01_sfnt_off00010c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3F 11800 bytes
SHA-256: 851b11e313a9af52df28a71439fc339910b59dc1be30a1d354bfd55814f135fe

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