Malicious PDF — malware analysis report

Static analysis result for SHA-256 8387b2f137d677b3…

MALICIOUS

PDF

75.9 KB Created: 2021-03-01 23:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: af12c47607b06ff6d502ed56de17c7f0 SHA-1: cc83976c030629675857e75be4c0578540bd3f46 SHA-256: 8387b2f137d677b385b97bd99efe1ab4c16b062001f812dfc936b79f80f05a36
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's used to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/strik?utm_term=fitbit+versa+lite+update+failed PDF link annotation
    • https://gukejokofa.weebly.com/uploads/1/3/0/7/130739315/ludetininevito_raruzutifazik.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/90489105489.pdfIn PDF document text
    • https://wapapoda.weebly.com/uploads/1/3/4/5/134581042/fufigejimuzevawu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_6015a50f66ffb.pdfIn PDF document text
    • https://botakukejase.weebly.com/uploads/1/3/4/6/134610266/daboxusolaz.pdfIn PDF document text
    • http://giwitijudaleka.mygamesonline.org/ged_math_study_guide_2021.pdfIn PDF document text
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/nanigudigesivu.pdfIn PDF document text
    • https://guzepebizosi.weebly.com/uploads/1/3/4/8/134880367/gotomunamave.pdfIn PDF document text
    • https://sawobefuridavo.weebly.com/uploads/1/3/4/8/134895752/losot.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/duracell_1000_charger_flashing_green_light.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/zefore_vujuduk_funugagaxasir.pdfIn PDF document text
    • http://bumumapa.mypressonline.com/tarururore.pdfIn PDF document text
    • https://sikenobavusemel.weebly.com/uploads/1/3/2/6/132682861/02feb2ccb2c27b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiwatimab.atwebpages.com/que_es_la_historia_universal_contemporanea.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/fluke_microscanner2_cable_verifier.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/84107057574.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/mabawifozuwokumiwomutoju.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_off0000ebe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE6 5188 bytes
SHA-256: 25852360ae7a1f5a453316d4aa5a8e8d08aa624ca43efa73086c96002c55c35a
font_01_sfnt_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 10832 bytes
SHA-256: 42df0a8dad5d0fc3ceaf75d87b4f98acaf04910dbb749f0540f086cb311ece7e

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