Malicious PDF — malware analysis report

Static analysis result for SHA-256 496d22502377e9b2…

MALICIOUS

PDF

75.9 KB Created: 2021-02-19 08:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 51c7e3578ed9e4b7f814ef91bf139a41 SHA-1: 9f3fe1ab8df023f32bea847ccf9d549cb5da6c8f SHA-256: 496d22502377e9b283fe5d43fb164a6a9ed2f1e3bd8781742377065c65236370
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=the+mabinogion+sioned+davies+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5fd3dbdcc5aa3.pdfIn PDF document text
    • http://vsspb.ru/guess_the_candy_quiz8vwxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_60257e97ddf94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5fdcb8ea8a090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_600e2283beb45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_60209d9c1eff4.pdfIn PDF document text
    • http://sokuzise.iblogger.org/84198403305.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_5fd644a406784.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462046/normal_5fd6a69166c9c.pdfIn PDF document text
    • http://onenature.space/princess_robot_bubblegum_car1e8zx.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dalotatafajadad.epizy.com/bully_lite_apk_data_mod_adreno.pdfIn PDF document text
    • http://nalasorujuwasop.rf.gd/dedoburugipuku.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/12837087118.pdfIn PDF document text
    • https://s3.amazonaws.com/mubefula/is-_200._c_fema_test_answers.pdfIn PDF document text
    • http://ziperajotuvap.rf.gd/sodeja.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/american_truck_simulator_money_mod.pdfIn PDF document text
    • http://dopodisimedu.epizy.com/2495042744.pdfIn PDF document text
    • https://s3.amazonaws.com/xuxifuzituwu/27199231336.pdfIn PDF document text
    • http://foxorefo.epizy.com/62082071537.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_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 5476 bytes
SHA-256: 05744c836f61543fe618192a24f482489b9c84900fa7b56373362f7f45bf330d
font_01_sfnt_off0000fe84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 10388 bytes
SHA-256: ccea4d546a2e7b6bf8dfaf191a32e13685aa7dcc29bc4771776868f5454e1465