Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83143796eb2dd5b…

MALICIOUS

PDF

93.4 KB Created: 2021-04-07 16:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d3af0a26d1c82bb698c3b3efff6ca624 SHA-1: 693b5f326c0c2ac64528ada46eb9bdf9f6499c00 SHA-256: e83143796eb2dd5beca2a4c5032e5d7b89040ea898b25b5123e147162fcc5e90
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'maypoin.ru', suggests the document is part of a link farm designed to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, aligning with the PDF's metadata and its likely use as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://maypoin.ru/123?utm_term=gippsland+free+to+air+tv+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417808/normal_5ff0dfafb1ac9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_60004f27d5e3c.pdfIn PDF document text
    • http://rowewuxeg.getenjoyment.net/minolta_srt_101_vs_102.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386086/normal_6066e0e85e305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_6052e62019327.pdfIn PDF document text
    • http://interbank.link/barbie_girl_dance1ba93.pdfIn PDF document text
    • http://datovufes.scienceontheweb.net/isolobal_analogy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418788/normal_601aabad0e632.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409818/normal_6000c861ecaef.pdfIn PDF document text
    • http://webdefilmizle.com/pusasatisixibaxisovadfbv8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500438/normal_60610255465aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_602ac94ebdc8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/what_words_should_my_18_month_old_be_saying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68a1966e-2224-4f2d-9228-6f55ec573e3a/how_to_track_certified_mail_receipt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba31420-9a5f-4ec9-956d-1da7ee07247e/wrath_of_zombies_2_hacked_all_plants_unlocked_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/fusopoxipo/united_colors_of_benetton_underwear_size_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f8e42c6-3a30-46ae-85aa-c5128505b8a2/80248506456.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2c9c082-cc81-42f8-867c-be1128c1c17a/xajozewegelu.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/45915138561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f19fbe35-9596-42bd-8ed5-570b82d65cb7/kenajujesoforada.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/netgear_wnr1000v3_wireless_bridge.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 5300 bytes
SHA-256: 6c0e367451f0b0fb068208a9e045f61f60785922aeb81f85e2f6efa79b5841b4
font_01_sfnt_off00013713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13713 2024 bytes
SHA-256: a511fb262e2f240b0cc62b800179189f1c69c7b4d67d938f9bc0c5e12ef74554
font_02_sfnt_off000140a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A8 11460 bytes
SHA-256: 8c7f79cfe8355966199d02d75644d5e58ca3ebc93924d6eed216a4f21abd4054

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