Malicious PDF — malware analysis report

Static analysis result for SHA-256 a02660d45284c203…

MALICIOUS

PDF

75.7 KB Created: 2021-03-06 14:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: bd189bb4f8acde6f9809058bbecdb7d9 SHA-1: e6b996a622130ae5591571eac4192f03362234f3 SHA-256: a02660d45284c203fea1a6d1a84eb66c5de6084d6ab2f72a4b7686193c9d5ea9
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 hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=maze+runner+book+set+australia PDF link annotation
    • http://zobotalemogi.sportsontheweb.net/how_to_draw_animated_characters_on_computer.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/how_to_do_silver_glitter_eye_makeup.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/fibekakogalowomatasex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450426/normal_5fdbd440e87e0.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/95919038956.pdfIn PDF document text
    • http://guzexesuge.mypressonline.com/zojirushi_ns-tsc10_vs_np-hcc10xh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367912/normal_602967ae90c00.pdfIn PDF document text
    • https://xavabakonoliwif.weebly.com/uploads/1/3/4/4/134477423/dapojimujuzebujet.pdfIn PDF document text
    • http://1eyvgo.xyz/7913825056545y3q.pdfIn PDF document text
    • https://wimegipovuxu.weebly.com/uploads/1/3/4/3/134373819/rujesitupa.pdfIn PDF document text
    • http://smartbright.club/bojibusosuwonafmagq.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/mejojatosi.pdfIn PDF document text
    • http://cosmosqrab.online/tunotizaneselojowexfwxlg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sawesupunozigiv.atwebpages.com/59290857615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9201945c-de1d-4165-bcc7-b03394359113/xavitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/206c5cec-6539-4493-8a17-455d0f5b5575/memnoch_the_devil_ending_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51c3e8f7-af16-4747-a3ff-c7ac2f7464f9/c_programing_in_hindi_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b57b407-5832-49d4-8289-3dcb9dc688f2/57622698776.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1172744e-148c-469f-9f54-98f1645ccf41/rousseau_discourse_on_inequality_part_2.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_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 4936 bytes
SHA-256: c59a3fb819e0ee50e07d2b9a100b6bca5642a0b5ba3bf525ede1f688fe248c3d
font_01_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 11224 bytes
SHA-256: 39dcc002bf83672f433809ebbe3e6d1a6bc71c1ebf36d97a01e88ca4e4075316

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