Malicious PDF — malware analysis report

Static analysis result for SHA-256 4765c504b3161e64…

MALICIOUS

PDF

77.0 KB Created: 2021-04-06 06:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f732833b271ece971d4d18d9d43e6e40 SHA-1: ced243607018dcf74cac889461038e07c5a58f9d SHA-256: 4765c504b3161e642b84d6a2f11dd6a5fc953a3653033cc46888bd153889a3f7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to disposable domains and potentially malicious content, as indicated by the ML classifier and ClamAV detection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm designed to host malicious content or redirect users. While no scripts were explicitly extracted, the presence of embedded URIs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jumiwimov.ru/wix?keyword=wow+sandstone+drake+guide PDF link annotation
    • http://daxamel.mywebcommunity.org/rejowogumagesugefuleku.pdfIn PDF document text
    • http://kinikapiv.22web.org/80456587359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467593/normal_602e4816f4064.pdfIn PDF document text
    • http://mekuwomusaxonod.22web.org/academic_reading_passages.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392215/normal_600d28dd3f94a.pdfIn PDF document text
    • http://nibewubixela.getenjoyment.net/1275081690.pdfIn PDF document text
    • http://tuvurebomiworo.scienceontheweb.net/bundesagentur_fr_arbeit_antrag_auf_arbeitslosengeld.pdfIn PDF document text
    • http://maxobujixeweden.sportsontheweb.net/91997598183.pdfIn PDF document text
    • http://durasazi.iblogger.org/bala_bala_video_song_akshay_kumar.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/25596629284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413016/normal_5fd8b00884bc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0934dc2d-b02f-477b-ba8f-ce0062e135ae/dapple_dachshund_puppy_for_sale_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/diwitapezu/webalamuzaso.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/house_inspection_report_for_immigration.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/losatokoxedatofutefe.pdfIn PDF document text
    • http://vanomuwoz.epizy.com/stock_market_for_beginners_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/040f356e-c2f5-49bc-9509-2889c5d35bd0/taxukukukuvomin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b82227-c532-454f-a043-aaa98f0e922c/how_to_build_the_ultimate_shooting_range_bench.pdfIn PDF document text
    • http://rabuxevemut.rf.gd/how_many_calories_in_a_medium_sonic_slush.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/5350530406.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/82707176482.pdfIn PDF document text
    • http://zogosugo.onlinewebshop.net/pasukudiwewomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7807fc7b-2c95-4731-a055-1b494def2f15/authors_purpose_in_writing_orpheus.pdfIn PDF document text
    • http://mixezized.myartsonline.com/wexudozi.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_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 5128 bytes
SHA-256: 762428332b763dff90d79eaa4802e794661e2127dcc993db78cbb68b7b633d95
font_01_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 11632 bytes
SHA-256: 39c2e546a9d2820a87b4f1889f58c4aec1dcc3e92494e93289029f5f0730196d