Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76abafe6a09c8d4…

MALICIOUS

PDF

82.8 KB Created: 2021-05-18 15:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 47c225e1059778045699d0b4e5604872 SHA-1: 230e8f36b23257b591f6abf669ed6a283551d276 SHA-256: f76abafe6a09c8d407a15a1cad2d178ce25cba8a8101afa9e66ce076b8c420be
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs and is flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_URGENCY_LURE' suggests the document body, though heavily obfuscated, likely contains text designed to create a false sense of urgency to prompt user interaction. The presence of numerous links on disposable hosting further supports a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=bise+lahore+supplementary+result+2020+2nd+year PDF link annotation
    • http://xuforixek.22web.org/oxford_dictionary_of_banking_and_finance.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465257/normal_605805301b4bd.pdfIn PDF document text
    • http://misefosoteb.iblogger.org/kerex.pdfIn PDF document text
    • https://kewejoxenolubur.weebly.com/uploads/1/3/5/9/135966954/kezonufebesesavid.pdfIn PDF document text
    • http://tebifujokejub.22web.org/5019024382.pdfIn PDF document text
    • https://muneberixiloza.weebly.com/uploads/1/3/4/3/134339704/xuladimovanuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373517/normal_5fde496ecf1d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_605fbc58573e5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizekalukojulap.rf.gd/atalasoft_open.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/tabla_de_integrales_y_derivadas_completa.pdfIn PDF document text
    • http://wijokinesuj.epizy.com/82422153949.pdfIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/food_web_activity_answer_key.pdfIn PDF document text
    • http://mivogunav.rf.gd/vtech_phone_answering_machine_not_working.pdfIn PDF document text
    • http://dokubuxopid.rf.gd/radogeroxumeposojeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c44575-f83b-4eea-a938-8bd66436a0ab/how_to_change_a_instrument_cluster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda7553b-65a1-4083-92c4-518bd3a597b6/62418558953.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/pitesebumosat.pdfIn PDF document text
    • http://xotewewo.rf.gd/56873272345.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/194c8d51-aeda-4ada-b9af-e6234afb50ba/83014413728.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da2ed488-10e5-4004-8487-2954a9d974d6/datepokigirarimerejawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddacc63c-8ca3-4076-81bf-ee998036d6e7/88743957088.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_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 5624 bytes
SHA-256: cfbea9fe4b642868aca9e7ba9aed857e10b46a67b340c6be5d79e33208d6ad0d
font_01_sfnt_off00011802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 11008 bytes
SHA-256: 853d23179663360f411749be2067e3dcbe97a80203d797ade319e9677e11ee34

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