Malicious PDF — malware analysis report

Static analysis result for SHA-256 c425a15d55cfb34e…

MALICIOUS

PDF

68.8 KB Created: 2021-02-15 19:27:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4c2ee7bcf1b28899a59b9d926a3a4510 SHA-1: 536acdf0f5cf3f40a0b22307574f58b57d79c8fc SHA-256: c425a15d55cfb34e3e60a54cadfda0a9bcc7404f59dec96f2d3cd469a6cbd8b5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, with many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/strik?utm_term=how+do+you+program+att+remote+to+tv PDF link annotation
    • http://copyrights-notices-helps.com/maths_questions_for_class_4pa66e.pdfIn PDF document text
    • http://pressit.fun/kipizyxuwr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459929/normal_5fd7a4780290a.pdfIn PDF document text
    • https://cdn.sqhk.co/fofotixoz/jAMgejf/16182980142.pdfIn PDF document text
    • https://bolumuratojepo.weebly.com/uploads/1/3/4/7/134749128/botonidibi.pdfIn PDF document text
    • http://rebujewemiv.66ghz.com/student_council_secretary_speech_template.pdfIn PDF document text
    • https://bevarari.weebly.com/uploads/1/3/0/7/130740456/d15a076a39b9284.pdfIn PDF document text
    • http://dektesheff.xyz/odd_eyes_dragon_ys14tarkh.pdfIn PDF document text
    • https://ramimuluvisefo.weebly.com/uploads/1/3/0/7/130775145/pizojolexiwaluf-nupewo-tegin.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/jbiihjw/pokafepomo.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/iieibgh/cruise_travel_agent_jobs_near_me.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/gofidina2vwi3.pdfIn PDF document text
    • https://cdn.sqhk.co/mezadisedud/eGigEtH/strongest_capsaicin_cream_cvs.pdfIn PDF document text
    • https://cdn.sqhk.co/dujagazatad/jjbMVib/linking_verbs_worksheet_middle_school.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/1yGrjh2/paper_and_spark_digital_agency.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tijopuzotozume.rf.gd/spiderman_venom_wallpaper_android.pdfIn PDF document text
    • http://bitesokilok.epizy.com/catnapper_transformer_sofa.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_off0000d237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD237 5284 bytes
SHA-256: 665b6ecb114b6de581c365e320144cb0d067f8b4cfcb09754347021c1fe34502
font_01_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 9828 bytes
SHA-256: 5a669b581652d5439f23b0eb1108a24c1a15147c4226d471f8858e601db141fd

Open this report in the interactive analyzer, or submit your own file for analysis.