Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e6efc50ba46411…

MALICIOUS

PDF

71.8 KB Created: 2021-03-30 03:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e9505bffb9beeaf67e93cf283f9bc283 SHA-1: 23bc8facd61014cf9e3cb77a050bc6fc3c48ee87 SHA-256: 12e6efc50ba46411dcb528cf455f1e7a414557c3abcec292e3583e2e45851b76
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the phishing detection suggest the PDF's primary function is to facilitate initial access via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/award?keyword=bauderflex+dna+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476270/normal_5fd64d568007b.pdfIn PDF document text
    • http://usacreditmonitoring.info/kewavivaxafynzdm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373769/normal_605dcce099ad5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_6048f1d4c7308.pdfIn PDF document text
    • http://vijoviresole.mywebcommunity.org/fefanosaxokezu.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/17163952665qn2wp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465938/normal_5fd9e32360d0c.pdfIn PDF document text
    • http://on24-system.club/zowitivuwotadisaxokz5vt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444884/normal_602ff17b0a7a8.pdfIn PDF document text
    • http://vadosixajobirug.mygamesonline.org/kanivabomabozugaselugugeb.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/mexumabodutawabugapi.pdfIn PDF document text
    • http://beamorem.com/kibomironotexenoburex6flkt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf71933-0993-4975-ae84-63fa97379f64/65035137127.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad77e889-5d85-4784-891f-ade070175f69/born_a_crime_chapter_17_and_18_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8af1b5-6bd3-4f1b-807c-ced4d281073b/lenuxumekupepexixoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46bb7f4b-4674-48ce-9343-fb9ac1e84fc9/heil_hvac_distributors.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e42980ce-64c1-44c7-ac4a-cf498e0c1272/what_is_the_best_pellet_grill_to_buy.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_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 4972 bytes
SHA-256: ae6374be120c7f7edc9396160d1d347b18ff6610780915c4e7f5eab9c7299e88
font_01_sfnt_off0000e08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08D 2204 bytes
SHA-256: cd9e09715341e6dd613c73927d9821fc0bafe98427928afd9f2eee9b05c99c81
font_02_sfnt_off0000ea30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA30 11528 bytes
SHA-256: 2f9b01757f355b5c35adf4b718414829036e09cc16b053427abbf4d12e61c2db

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