Malicious PDF — malware analysis report

Static analysis result for SHA-256 1697b81c22c40688…

MALICIOUS

PDF

78.9 KB Created: 2021-03-14 12:15:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3cc2526ee018580baa4de1de76c0936d SHA-1: 59e0134ac078bd48279f80a5ecbcae47f146a516 SHA-256: 1697b81c22c4068800c81c94d7954ddd4a69dc3af960c445304ccae0df98aa9e
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links, many hosted on disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to numerous external URLs, suggesting an attempt to lead users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=azure+data+factory+transformation+example PDF link annotation
    • https://gidujinogojavu.weebly.com/uploads/1/3/4/0/134096303/1700429.pdfIn PDF document text
    • http://morikulifitoj.22web.org/80225685449.pdfIn PDF document text
    • http://majikok.mygamesonline.org/3530318036.pdfIn PDF document text
    • http://jujovobima.getenjoyment.net/14628141976.pdfIn PDF document text
    • https://gisimezibeze.weebly.com/uploads/1/3/0/8/130874543/suwezi.pdfIn PDF document text
    • http://liberum.sportsontheweb.net/i_hope_youre_doing_well_lyrics.pdfIn PDF document text
    • http://rumigiwataj.getenjoyment.net/jixuronerude.pdfIn PDF document text
    • https://dorizusedi.weebly.com/uploads/1/3/0/7/130776489/1185030.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tobikinos.onlinewebshop.net/tadomizo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f092babe-97c2-4e10-b347-abc581da3641/fitness_blender_workout_calendar.pdfIn PDF document text
    • http://vivowaduw.epizy.com/76978536270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa56287-480d-4a85-b176-762437d00ae8/fererajupozukasu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17f29a35-4d75-48f6-b1dc-c6c28efd4e02/sole_fitness_e35_elliptical_trainer_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb60f078-fd1e-4435-b90d-99392847a530/is_double_dating_good.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/what_is_your_90_day_plan.pdfIn PDF document text
    • http://telifujovemevo.atwebpages.com/manual_teclado_yamaha_dgx_660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41cff7eb-97e3-45e5-8967-3c30de5b9b68/sauder_5_shelf_bookcase_instructions.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF383 5512 bytes
SHA-256: 66f4af338dc182db6af2d8c766b5036b4df86a128830a43cacb886d3508b0b80
font_01_sfnt_off0001064a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064A 11928 bytes
SHA-256: 91dea69af3b95a27f091385605a9b9174bb9d18c132e0d20fe6c6b69ce85cbcb

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