Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dc4771974488d8…

MALICIOUS

PDF

72.0 KB Created: 2021-01-13 19:07:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 73995259c2b0f03571aa87d2d64c544e SHA-1: 86d685abcc2dd9c650ad091bf63f311b47fa2748 SHA-256: 78dc4771974488d8f210c5ae08ddc2a99af3879d9b94f0f5e8ef75a823898766
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to an 'android tv box remote app'. The presence of multiple external PDF links, some pointing to benign content and others to unknown destinations, indicates a link farm strategy. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/aws?utm_term=x96+android+tv+box+remote+app In PDF document text
    • https://static.s123-cdn-static.com/uploads/4482190/normal_5fee73ca3468e.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/namisabijirufipix.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/ihVRggj/xilutozotojovowejenub.pdfIn PDF document text
    • https://livubefelamujir.weebly.com/uploads/1/3/4/8/134899239/rukexukufugaxamokesa.pdfIn PDF document text
    • https://cdn.sqhk.co/munoforifuso/jia5jdv/snowboard_master_3d_online.pdfIn PDF document text
    • https://site-1203255.mozfiles.com/files/1203255/cbse_class_9_science_book_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5f8eceac1cee2.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/sinamozagemoger/aashiqui_1990_full_movie_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/android_bottomsheetbehavior_listener.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/sentences_with_specialize.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/quiz_games_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/vivosevuwivurimek.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_off0000df08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF08 5452 bytes
SHA-256: 42e284afd9ac983659a2095121690a5e3ada02841c63f14649f47491d0c90453
font_01_sfnt_off0000f172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF172 10140 bytes
SHA-256: ca91cc8245bb049dc05fea9e215066be06265e05b43431196e82ca2ef6334e9f

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