Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1be4a4342a9429…

MALICIOUS

PDF

106.4 KB Created: 2021-03-30 02:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3c00a13b5d8a4784048bfc21b4e3b769 SHA-1: efef96b3089e9f4eef73d988fbebbfbbfd6a24b0 SHA-256: 7c1be4a4342a9429ba7be86f6954251fae1efdf93aaf6a55f2adf30d07c38efb
186 Risk Score

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 designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://midufefew.ru/123?utm_term=dnd5e+moon+druid+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446643/normal_605f3d4cbaac3.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/r8MHlia/wixubopeva.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_6050d55f19d71.pdfIn PDF document text
    • https://gulapekojikag.weebly.com/uploads/1/3/2/7/132741551/3eee64afafe6.pdfIn PDF document text
    • https://cdn.sqhk.co/tefebenum/i1JEu1g/58281543671.pdfIn PDF document text
    • https://cdn.sqhk.co/wujukipako/FGobRjf/warriors_cat_adventure_game.pdfIn PDF document text
    • https://pogupevupawigo.weebly.com/uploads/1/3/5/2/135293313/jufat_vavigopup_kagituxu_dawupexofa.pdfIn PDF document text
    • https://xevefoworux.weebly.com/uploads/1/3/1/3/131380592/a3c31144dd3.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/d8tWuWo/10656308680.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372076/normal_6055a8c936c96.pdfIn PDF document text
    • https://vojimefijizudi.weebly.com/uploads/1/3/4/3/134310580/puxumito-tudalidobuvek-juvowexifewukug-sazebaroto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454299/normal_5ff995efebfc5.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/igjfJHc/54102332487.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/29932a06-6e9d-4e41-b88e-e0b33252cb07/how_to_connect_directv_to_insignia_fire_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a68237-c0b9-4830-9734-d0d63810528a/96426439117.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b16042-8461-407f-8276-7f8596784959/does_water_have_a_dipole.pdfIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_3b212acf92404722ab440d1be168cf24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c288a00f-d925-413c-a665-30fe7ab0c197/speed_queen_dr5_dryer_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/778bb511-8bbf-433d-8ee2-c44357b5f16a/canonet_ql17_giii_lens_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70987e38-01cc-4dcc-9041-148f6adc2070/zujuvatapan.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_7a36e1078c6742408d8129cd531d1503.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f961985e-7914-48ed-82d5-30e16bae4b1b/48894433319.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_off00015928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15928 4648 bytes
SHA-256: e2f7d8e1ac208410052e589ba885a8127ec910b5bbf1850bb49162a32cea9316
font_01_sfnt_off000168ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CE 10896 bytes
SHA-256: 54cb673ba69914e457cdbaef170ba964d8849c85731b96bde45526d2f0337a44
font_02_sfnt_off00018def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DEF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361