Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb6566f14187071…

MALICIOUS

PDF

97.1 KB Created: 2021-02-21 02:49:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 75f7cd33e3280967999cef0226f01b96 SHA-1: 4bf366156d3dd92f557ee75dca021af951e23a48 SHA-256: 9cb6566f14187071946e13633daf2b0f4ea2db9069559ce5fa4ff2d3a7312b28
194 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to various PDF documents, many of which are hosted on disposable domains or subdomains. The presence of a 'download button' heuristic and the ML classifier's high confidence score, along with ClamAV detection, strongly suggest malicious intent. The primary goal appears to be directing users to external resources, potentially for phishing or malware distribution, under the guise of providing free learning materials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/strik?utm_term=urdu+to+arabic+learning+books+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/busumodofu/U4gjAZw/portal_quest_fantasy_examples.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/zolorol.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/jblugji/digital_marketing_course_udemy_review.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/ehoX8hh/bavuwebemo.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/agghvKT/juronokitizapekijaxo.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/nabavad.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiwaduna/xuDxibm/vikik.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/VgjuDrE/zombie_party_decorations.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/1BycL1R/20621638772.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/5007889.pdfIn PDF document text
    • https://zijobezugol.weebly.com/uploads/1/3/2/6/132682913/kefedabi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/blockchain_technology_book_free.pdfIn PDF document text
    • http://midelex.epizy.com/groupby_transform_pandas_example.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/what_does_the_term_apples_and_oranges_mean.pdfIn PDF document text
    • http://zawemitop.epizy.com/sonuxesosasemuver.pdfIn PDF document text
    • http://witosef.rf.gd/android_pie_minimum_hardware_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/23025805095.pdfIn PDF document text
    • http://dowupozor.epizy.com/bin_tnh_music_sheet.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC2 5612 bytes
SHA-256: d8b16f1f230640d6e773152230619860bc3b80db65be2eca490822522cde55cd
font_01_sfnt_off00012dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFA 11876 bytes
SHA-256: 41a28f9ed518da0b101e177881edf11b10757c02b6857ab3e33d44eb4f978fbf
font_02_sfnt_off0001541f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1541F 20496 bytes
SHA-256: d5cabee57806c6220bbefb80f68eb7ba985dbc22446a840acb8142d61c97644d