Malicious PDF — malware analysis report

Static analysis result for SHA-256 e590bec57203d0ea…

MALICIOUS

PDF

107.3 KB Created: 2021-04-30 11:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5cc8e4753a8e3c9ed334cbeada7bfa3b SHA-1: 9fdb03e5b6e133718c65840bcb34cfe324b50cfd SHA-256: e590bec57203d0ea3b6685cced42d488adfa3774037e085986a60194b15d0fa2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://leonvi.ru/strik?utm_term=us+postal+service+zip+codes+4+digit PDF link annotation
    • https://sogazefod.weebly.com/uploads/1/3/4/0/134000298/4ce1d7b5dd8745e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5ff1ca726f9df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421641/normal_60312b3c6067f.pdfIn PDF document text
    • https://cdn.sqhk.co/rapowipijes/hfcjcbC/speedometer_online_mph.pdfIn PDF document text
    • https://cdn.sqhk.co/wabogojo/fQ8jePV/caught_on_camera_news_reporter.pdfIn PDF document text
    • https://gunujudota.weebly.com/uploads/1/3/2/3/132303168/5962491.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/0kk95Se/nivikesavapemaxuduta.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/debukakuzoga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378831/normal_5fc613cc9281c.pdfIn PDF document text
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/vabeluxot_jobojilarapaka_romimoporutefos_vatojosekajefaw.pdfIn PDF document text
    • https://wokonupojelofa.weebly.com/uploads/1/3/5/3/135351156/jumaf.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/xJ2jcja/tangled_2_trailer_2019.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/turoka-vufivese-bamabatikisi-lakizoxux.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/EiaheBZ/a_ball_falling_under_gravity.pdfIn PDF document text
    • https://zudoxinegez.weebly.com/uploads/1/3/4/1/134108693/borewuzoti.pdfIn PDF document text
    • https://xisedemagi.weebly.com/uploads/1/3/2/6/132681548/xusej-lezafagajezati-begixi.pdfIn PDF document text
    • https://donigulajerilag.weebly.com/uploads/1/3/0/8/130874297/9984889.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374009/normal_5fe2b31617dd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6008c7a-d798-4a98-a6d1-571e69bb4cc8/tempe_town_lake_running_path.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d96cf05-67ca-43fd-b5b0-dfa4d0948d7a/scansnap_s1500m_macos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed664135-eabe-4d10-a85e-1dde34be051c/wobedikosu.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/shooting_drills_for_concealed_carry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8f2c3b3-c74a-467f-8c7d-5a124608d6af/zuzuzesemepidaxow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0d99c8c-feed-47af-88ef-ff18801be38f/40947974944.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/simple_present_tense_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/59392484719.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_off000163ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163AB 5428 bytes
SHA-256: 7ec59016f872f1e2399c5583fad9d38cf2c2565451a3cab2a2445203cb568cab
font_01_sfnt_off0001764b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1764B 12124 bytes
SHA-256: 7ab96c59a269ca54f92650688aee67b99fc710de56af8f846c84d2e12c57b7a0

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