Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff6a56e55c3c4ef…

MALICIOUS

PDF

83.6 KB Created: 2021-04-15 10:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 05e4cbec2a872bb0a28003e5fff5f128 SHA-1: 3ac65bf855cab54fabe7c7bd4b020f4137f33330 SHA-256: 0ff6a56e55c3c4ef6795da86d9b49dce52d3be5141598bfb3139df043be43c7c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=diary+of+a+wimpy+kid+now PDF link annotation
    • http://ratixopawem.mypressonline.com/cancer_espinocelular.pdfIn PDF document text
    • http://jopagozopive.medianewsonline.com/alice_in_wonderland_penguin_readers_level_2.pdfIn PDF document text
    • https://cdn.sqhk.co/ferorigife/3WxjbLO/badland_winch_remote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413226/normal_605701bc4009f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_604a403901dfb.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/ada1f2b8074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372707/normal_5fe0b86d2ee7b.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/jaU2bjb/robet.pdfIn PDF document text
    • https://fisenekapiwu.weebly.com/uploads/1/3/1/4/131437930/9857560.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fejusadifidexi.epizy.com/building_automation_system_basics.pdfIn PDF document text
    • http://giwoxig.rf.gd/ethical_issues_in_marketing_and_hrm.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/android_10_gestures_review.pdfIn PDF document text
    • http://gefetela.epizy.com/gaxerelogipibewuzix.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/transitional_phrases_first_body_paragraph.pdfIn PDF document text
    • http://vogojitipam.epizy.com/mathematics_worksheets_for_grade_2_division.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/2005_dodge_ram_1500_power_window_fuse_location.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_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 5232 bytes
SHA-256: 3a5c44fba13a81056cc89de3ef2b80f6e38e6c094b68f7c5e98c487ae2032bc6
font_01_sfnt_off000118b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 11752 bytes
SHA-256: 38ac3fa53e8039cd6d16d0b023fd53a2ea76ea486a20a0e02ca3c542b0d7e706

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