Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa6e4423b157d70…

MALICIOUS

PDF

81.0 KB Created: 2021-03-24 05:23:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fcfd5ac82ca66cf1f2b4323f79b6fcb1 SHA-1: 06206afd0c52415615f058aa258e18a9b29aa373 SHA-256: 3fa6e4423b157d70d11df454e1e733857af1d70b16b7d9e8f49f960f2a732893
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification. No scripts were extracted, but the document structure and embedded URLs are sufficient to infer a phishing or malware distribution attack pattern.

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
  • 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://soxebez.ru/wix?keyword=album+apk+surfboards PDF link annotation
    • http://vipmanmarket.space/towigosijh7yx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454995/normal_5feaf2033a258.pdfIn PDF document text
    • https://bolifalaloken.weebly.com/uploads/1/3/1/4/131438202/1a1078f8.pdfIn PDF document text
    • http://bozakotoluzi.iblogger.org/rafokin.pdfIn PDF document text
    • http://lulodexov.scienceontheweb.net/advanced_sql_server_interview_questions.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/5202889.pdfIn PDF document text
    • https://gobalubige.weebly.com/uploads/1/3/5/3/135339343/179089.pdfIn PDF document text
    • http://usacreditreport.info/what_does_safety_dance_meanv2ig1.pdfIn PDF document text
    • http://rixerudawane.iblogger.org/8107514042.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487007/normal_5fedbdf9663a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_60462dfde1361.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/lojifexavosotimeverib.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/selejizixabet.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/lol_patch_notes_11.2_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/new_bhojpuri_movie_2018_free.pdfIn PDF document text
    • http://gewegut.epizy.com/xesunikabulokagepogetosi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 1528 bytes
SHA-256: 68fc7b7a748f9af9722f74a362c3a817ea7369da6592dbd58f25ca1265c98c1b
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 5380 bytes
SHA-256: fe2941adb15acacac1e0d65a64ffbe555b1f07837a971391f3561033dab064f3
font_02_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 11864 bytes
SHA-256: 5d2b2b1dff5532fbd043d016b7ed20bbc7dd292f4a79dcd7436562ab76d91e4f

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