Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c5ccb74f34ada98…

MALICIOUS

PDF

75.7 KB Created: 2021-03-20 16:30:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 11a47befcf0fbda731dc2b8143153ea7 SHA-1: b9936eeb37dfe001cf02e3eecf7487cd99608601 SHA-256: 1c5ccb74f34ada98ca68bf6dff5ced3ef698d83023ab7570d1a477a1dd9bf0c9
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/123?utm_term=platformer+rpg+pc PDF link annotation
    • http://labiosdewonda.com/632509611261y2vh.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/gafinitaplsl53.pdfIn PDF document text
    • https://tematurulabi.weebly.com/uploads/1/3/1/6/131606540/puweweg.pdfIn PDF document text
    • https://tofavasexivefet.weebly.com/uploads/1/3/4/5/134578877/kuzofupular-vevodo-nelif-kefuwe.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/aa669ef8e07722a.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/bedonivuxapul.pdfIn PDF document text
    • https://vesixogis.weebly.com/uploads/1/3/4/8/134863987/pizobometile.pdfIn PDF document text
    • https://bilagezapa.weebly.com/uploads/1/3/1/1/131163658/dubuxorowoximi.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/bekafodi.pdfIn PDF document text
    • http://tublitalia.fun/bubble_trouble_miniclip_gamezsz7t.pdfIn PDF document text
    • https://doxazefeseremef.weebly.com/uploads/1/3/4/7/134764644/bipulijur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zoxuditavuvov.rf.gd/namapobexupebiluwanu.pdfIn PDF document text
    • http://tititogejeda.rf.gd/bofisenu.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_737e13f2302c42f482b7584790838c8e.pdf?index=trueIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_aea6a79388ac4b75aba95bf4d4420a44.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_05050fc99a404631b119bc10739bee65.pdf?index=trueIn PDF document text
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_c66197c91b914789ac7f7d212f7c361a.pdf?index=trueIn PDF document text
    • http://kanisal.epizy.com/best_beginners_guide_to_stock_market.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e93561d2-6f21-4b5b-8528-2bd5c8e7f730/what_alice_forgot_summary_spoilers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ded0a2c-d3f7-4ece-85e1-fd9b9d6a38cc/82283991884.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cc29c8b-4d18-4708-8a8c-1bff0e338b1d/26401833152.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93470819-a0c3-4749-b916-fc09e5f0340f/rinuxazulowisem.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_off0000eab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB2 5160 bytes
SHA-256: 9d951427743fa564b3ee95cadc760b052b8c662ee304144875f67d1c0f54a195
font_01_sfnt_off0000fc34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 11024 bytes
SHA-256: 17c9a2b9973312e23743db2ad6a9a28f873ad99183d9038d804f701c2d8ab903