Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b9c081b88a5cd2…

MALICIOUS

PDF

80.4 KB Created: 2021-03-16 02:32:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 27a61238ad39242eda712e516a684055 SHA-1: a40d07c6f5935a21ffc8389f40ffd2cb8a00a75d SHA-256: c4b9c081b88a5cd21c503a79d957e8dc8284aea4b10fd386fe51a8cfdeaf70b7
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/strik?utm_term=most+important+aspect+of+film PDF link annotation
    • http://1xbet-football.fun/25076866412urao8.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/24160784148.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_5ff2b225981bc.pdfIn PDF document text
    • http://kipuleli.iblogger.org/dyson_small_ball_multi_floor_brush_not_spinning.pdfIn PDF document text
    • http://msertis.xyz/bella_high_power_juicer_manual0usak.pdfIn PDF document text
    • http://luchdobro.site/44172262308h3j6j.pdfIn PDF document text
    • http://peroruse.iblogger.org/7689447204.pdfIn PDF document text
    • http://hayatevesigar.online/12921574971jzvmr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412151/normal_5ff8fcfa7c907.pdfIn PDF document text
    • http://drenajkrasnodar.ru/66784662394y4y6x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jeborawaleko.atwebpages.com/briggs_and_stratton_500_series_158cc_manual.pdfIn PDF document text
    • http://tulazupuvive.epizy.com/20869787011.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_65da60f8660d4e8bbd7852dbaa1ecde0.pdf?index=trueIn PDF document text
    • https://0e67983c-e844-40c9-b604-97311ec94efe.filesusr.com/ugd/6e13d9_883f46baebdd433db1e7209a3b762a81.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_8aa104b0324842928b390ce7f1882568.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_576a2086edd24d22a9a697419e9f9104.pdf?index=trueIn PDF document text
    • http://bejumajiluwod.rf.gd/dusesuvagozonopave.pdfIn PDF document text
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_2ef094857ada4eb4ab8baae66dd0860e.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_a23b30e526a3431c986a20cb589980c6.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_30e3d6f2d4e346d0b03aac935941bece.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_ecaecaf6cfeb4e718e5bb4b2d44f4755.pdf?index=trueIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_0e5ce3a4b0484a9b966b29f9e175a444.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 4956 bytes
SHA-256: 1ce4c1362d2564f8287a5e3e8aa45206eddf522604b41d20aa0a3df3229c16d0
font_01_sfnt_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 10996 bytes
SHA-256: 7d0e9676215cff3cab9f4f248263f4233958d85419efca760336d4f802f844b5
font_02_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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