Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7dc6a53b558febc…

MALICIOUS

PDF

80.2 KB Created: 2021-03-24 00:15:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 1cf5dd0781e5c52143aea122c0204795 SHA-1: 6c8b384f595380ce966968202b739b521e832261 SHA-256: a7dc6a53b558febc3109edcd1dcf73b415673f063e4a00a0256ebd6557020420
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The primary purpose appears to be directing users to external resources, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 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/award?keyword=plant+virology+hull+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4367621/normal_600535a705c4f.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/miguxumesenazog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_6013ed486dc55.pdfIn PDF document text
    • https://pasazobunev.weebly.com/uploads/1/3/4/6/134670772/vatipokopabo_juxipusiwaja_ledafatapi_gewudo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410416/normal_5fe1fc23e3f92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_604497b493ec4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481408/normal_5fe6a59139660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_6021835b580ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421205/normal_60175443df41c.pdfIn PDF document text
    • https://zupevojug.weebly.com/uploads/1/3/0/7/130740492/627982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490375/normal_6030e78fd4501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465128/normal_60293897f0f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_604a44d21ac33.pdfIn PDF document text
    • https://tafuposavibado.weebly.com/uploads/1/3/4/0/134017079/0791e0e.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
    • http://sebokegekesuded.atwebpages.com/test_cuestionario_apgar_familiar.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/cinderella_man_guided_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/brownie_uniform_sash.pdfIn PDF document text
    • http://zizenatoxu.myartsonline.com/jipexofuzoxokexibotoz.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/logical_questions_asked_in_interview_with_answers.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/29151593452.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/the_isis_papers_paperback.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/24538704916.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_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 5052 bytes
SHA-256: b71705f796fda9c195120f7d55c260bc21076323167b6d1ac9aa307dc34af27b
font_01_sfnt_off0000ff00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF00 11712 bytes
SHA-256: 944e6457ac2085b872d33850894784c8b80e88f35cc9dfea24ab9769213332e1
font_02_sfnt_off00012598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361