Malicious PDF — malware analysis report

Static analysis result for SHA-256 885a409783c82521…

MALICIOUS

PDF

68.8 KB Created: 2021-03-24 09:17:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7f55f1b02d2d4b25e6223e10d291aeed SHA-1: b646064129278c39bd234bb02313da34f43f9fe5 SHA-256: 885a409783c82521e05f3759f861aa66696c48d44a4db0e7e8f13d5177cbc3d2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL suggesting a lure related to an 'answer key' for an assessment task. The presence of external URIs and link farm characteristics further supports a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=end+of+module+assessment+task+7.2+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408195/normal_6017876389f78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_60188b7d3be98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424645/normal_60075d1a09db3.pdfIn PDF document text
    • https://cdn.sqhk.co/wobimore/igJhfyf/pifikigadonogutejumedapaf.pdfIn PDF document text
    • http://wudebakafepi.mypressonline.com/ladokumuvi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496204/normal_6039f9636537a.pdfIn PDF document text
    • https://cdn.sqhk.co/sasibasodiwu/YjfidgN/word_connect_crossword_level_96.pdfIn PDF document text
    • https://cdn.sqhk.co/mifusekid/dqpyhj2/5752481124.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/ghd0Pjg/dude_perfect_doing_basketball_trick_shots.pdfIn PDF document text
    • http://gigewaxupupixe.22web.org/financial_table_time_value_of_money.pdfIn PDF document text
    • http://fumuroruzej.medianewsonline.com/53652562570.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/c6gdhiA/bmw_bike_wallpaper_hd_free_download.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/83969600165.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/nRIhirT/intermittent_fasting_low_blood_sugar.pdfIn PDF document text
    • https://cdn.sqhk.co/refimadaraze/hggkFwV/netflix_on_laptop_windows_8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499341/normal_600809ebac40d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wilafeduzavedew.epizy.com/petakoz.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/sorosuzevulujipiv.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/19258504141.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD112 5512 bytes
SHA-256: 4bf0359eef9b0292d2d18b1137b8944593c009e2c484c27a4f6c511b158593f3
font_01_sfnt_off0000e3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E2 9984 bytes
SHA-256: eb66a160b733adc2f49020c7687e347b817a3e8bcaacf42f596fed7b3259d8aa

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