Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c979b756c077cc4…

MALICIOUS

PDF

75.2 KB Created: 2021-05-06 19:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7f9d40a4937475ca54fd5a12a71c5560 SHA-1: b437f422affbf68291c058e7bbca6ed972836dda SHA-256: 4c979b756c077cc40a966e0133e8f925c93c0d23d18aaaca2bcdde946dfeea4d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as a phishing trojan. The embedded URL points to a domain that appears to be part of a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and external links suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=setting+up+airprint+on+canon+mx922 PDF link annotation
    • https://cdn.sqhk.co/gebemiwisero/DkidodN/rogue_gunner_pixel_shooting_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kowalaxu/iahd45u/77082092488.pdfIn PDF document text
    • https://zirorimasarikar.weebly.com/uploads/1/3/4/1/134108573/6478037.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/l1idwMI/260185951.pdfIn PDF document text
    • https://cdn.sqhk.co/xubipoxeguza/jevhcie/houston_bcycle_app.pdfIn PDF document text
    • https://mulunumidivopiz.weebly.com/uploads/1/3/5/3/135393794/1161575.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/6f24a13d-54e9-42e6-9543-1afbe0ad1bb8/what_does_starbucks_pay_their_baristas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb91c988-a09e-4e12-bb79-0b07a79e4e2b/64928228665.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/biochemistry_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421d68d4-a675-4435-b9d5-bdf548149417/craftsman_yt_3000_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbaae65-a5e2-49ab-9419-1fac04cb1c4d/avancemos_3_unidad_5_leccion_1_answer_key.pdfIn PDF document text
    • http://vazorilumi.epizy.com/35855307163.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/komobabiwifelito.pdfIn PDF document text
    • http://vanowawupusizi.rf.gd/que_son_las_bacterias_aerobias.pdfIn PDF document text
    • http://warufadul.rf.gd/vetemawusun.pdfIn PDF document text
    • http://pejebitopaw.rf.gd/roland_td6_drum_module_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/bhagavad_gita_chapter_1_meaning_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ee72d01-bf24-4963-b535-b5aa82a2d128/badomafamujufetox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e138109-b541-4f00-862e-2ed4ec98080a/western_snow_plow_dealers_bemidji_mn.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/dante_inferno_mark_musa_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/72193036509.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_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 5500 bytes
SHA-256: c327cdc9320ef24a8ec00f7ff27b63709a11d78bc95be321e6fca7dbf89feff4
font_01_sfnt_off0000f8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E3 10772 bytes
SHA-256: 5205e50885995a8d3dcc1628a58f6eb451f5be12739618b0a8bc30cb12b65c8f

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