Malicious PDF — malware analysis report

Static analysis result for SHA-256 832cad1a3eaa37cf…

MALICIOUS

PDF

103.8 KB Created: 2021-03-10 16:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1953e5fe30f345b74df103365fcad984 SHA-1: 9cdcfd1ff5e28c61b5ed8c7f0136e63058393177 SHA-256: 832cad1a3eaa37cf0b0c654248475e71c18d5d21fd7229392a2d7706fb049d8f
186 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 of which point to other PDF documents hosted on disposable or suspicious domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://pelibifir.ru/123?utm_term=endocrine+society+thyroid+guidelines PDF link annotation
    • https://cdn.sqhk.co/tobamozusaj/euai02R/96376052209.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/kanuruporeren.pdfIn PDF document text
    • https://cdn.sqhk.co/tigufarejeti/0ghMwjh/tangled_2021_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/ermjeid/venaxebebebepepi.pdfIn PDF document text
    • https://cdn.sqhk.co/pimabosi/jhAOwZS/snapping_turtle_animal_crossing_new_horizon.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/McjfV7w/vadifamo.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/9495982.pdfIn PDF document text
    • https://cdn.sqhk.co/sipobufiw/hihfhiJ/13983226453.pdfIn PDF document text
    • https://tefifegewa.weebly.com/uploads/1/3/4/3/134335978/6522569.pdfIn PDF document text
    • https://tirifojigem.weebly.com/uploads/1/3/2/8/132816165/jovedasereputo.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedijudibo/c7jdIhi/rezavuwizazogugujijux.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
    • https://uploads.strikinglycdn.com/files/3d385995-15a6-4927-973c-6f0878a082b2/xaxoxabovisigek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab54fc46-0921-4569-ba70-f926e3dd4937/56210089429.pdfIn PDF document text
    • https://ebcfae26-b4e4-4f1a-a5b2-c5bdbddc1bdf.filesusr.com/ugd/259f90_d2b8cbb56115404386842a17cd67590b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/invoice_clerk_interview_questions_and_answers.pdfIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_827a97764d894f13aeec7f01b48d1442.pdf?index=trueIn PDF document text
    • https://c3a7a64c-5591-430b-94d7-c2eadfdf3523.filesusr.com/ugd/966478_f862f921d8774ee9926aeebfddc2545e.pdf?index=trueIn PDF document text
    • https://fc060a1e-8c1d-4b7d-bafd-75f79d4c6355.filesusr.com/ugd/c0a468_a47655e5ca514a83a9af00f486804fc6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/10724603694.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/dexepejowetabinux.pdfIn PDF document text
    • https://s3.amazonaws.com/zatazewoz/weluxegirupegosa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13717 4932 bytes
SHA-256: 7717177220dea0bbd5c159245c9fa9c110d6c61759000f90c35b1a9652ea6491
font_01_sfnt_off000147df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147DF 11060 bytes
SHA-256: 4a8fe2c2a6b297d17f139cf8204d4d70f76b4cc02e3f8e6282719722e9ff9df7
font_02_sfnt_off00016dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DC8 16272 bytes
SHA-256: a1d034c4899da820a17195885c2d76cd6be3fce17d3f1660d9b3805b34643d2d
font_03_sfnt_off00018330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18330 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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