Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ffa60440980781…

MALICIOUS

PDF

92.7 KB Created: 2021-03-24 02:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 42bf56045dd641cf7e1658356871789b SHA-1: d12bf19f1379c9e5ec93866ba9b162703c25e4fe SHA-256: 28ffa60440980781954b43e73570e664f90ce2d2b802af6f832b892b5e94a7f7
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic firings indicating it is a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging client-side exploits or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://dugedepap.ru/strik?utm_term=singer+handheld+sewing+machine+manual PDF link annotation
    • http://apsdd54gfv.xyz/86827938247wnyt1.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/dihRWVT/ccleaner_app_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_6013cb9179802.pdfIn PDF document text
    • http://fartook.online/37207218224s4fnf.pdfIn PDF document text
    • http://momentshop.website/16385274496swls0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491151/normal_5fffe704ac6ed.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/Z7oS7hj/luke_bryan_drink_a_beer_song_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/fesoxuleri/iaggwZ4/bake_italian_sausage_at_425.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/jicUii1/45990646298.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493600/normal_5ff71a4b2eae1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_6059014bbca33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446915/normal_6045f67e49c70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488332/normal_60271f1967c25.pdfIn PDF document text
    • http://ludshop.xyz/solving_and_graphing_compound_inequalities_worksheet_answersclqe5.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/hi3Rjec/air_freight_manager_jobs_in_dubai.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_738e1bcb336d4ba0af3505e2da7e15be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/lagu_mesut_kurtis_salawat_burdah.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/aha_lipid_screening_guidelines.pdfIn PDF document text
    • https://a6053a4b-6066-498d-92a8-7748b68531bc.filesusr.com/ugd/5f0d2f_9a68636fd3834a52b33cff5367934065.pdf?index=trueIn PDF document text
    • https://a5a7f18c-b887-48a0-80cc-3627c14345d5.filesusr.com/ugd/609f59_940964e8a3d04c6a9334bd46517a1bdd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/jejubege.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_756ee87962f547ae99af48221d086e7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lofese/vujejabas.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_off00012c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8C 5548 bytes
SHA-256: 81f5e1ece07eeccf85753dcaebf7ba0a67b76ff6be50764f8725a048fc5274d9
font_01_sfnt_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 11176 bytes
SHA-256: d93bdc3ae92cf22504cca6065e7ea8949d4acf4e1f6a8cec9731ea641de8818b

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