Malicious PDF — malware analysis report

Static analysis result for SHA-256 3073920926236085…

MALICIOUS

PDF

80.3 KB Created: 2021-04-10 12:41:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: efc4e069f716d725565fb0b8fa49c369 SHA-1: 7e1f2ac7e9383497d3a322f17a482dc7d43fd9ca SHA-256: 3073920926236085fb43777b81e8b4610d73ab89f708e38edf29b08a51e258cc
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The document body, though partially garbled, references 'Apc back-ups pro 550va', likely a lure to entice users to click on the malicious links.

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://xezojetit.ru/strik?utm_term=apc+back-ups+pro+550va PDF link annotation
    • https://rudazijix.weebly.com/uploads/1/3/1/4/131453676/2922db7b.pdfIn PDF document text
    • https://silixumofabu.weebly.com/uploads/1/3/2/7/132712413/540644.pdfIn PDF document text
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/wezonunoxijina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_605c03127a307.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426063/normal_60028d8ea9604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_5fcbfd22cbfd3.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/5902169.pdfIn PDF document text
    • https://lifowedo.weebly.com/uploads/1/3/4/7/134707215/7226a0713c180.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462065/normal_601fe19e990e1.pdfIn PDF document text
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/xabesowetutuja.pdfIn PDF document text
    • https://tanedozuwo.weebly.com/uploads/1/3/4/6/134644204/81097ac1.pdfIn PDF document text
    • http://sokuzise.iblogger.org/blood_type_a_positive_diet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389804/normal_5fd6c2bc5c3f6.pdfIn PDF document text
    • https://lefofikik.weebly.com/uploads/1/3/5/3/135316562/wuzule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopodatus.rf.gd/82925494759.pdfIn PDF document text
    • http://garapaf.epizy.com/27155020981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f363910a-1113-4f8a-93ab-d640adc3e614/74897091651.pdfIn PDF document text
    • http://sokogukuvuxe.rf.gd/9075265292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de35dbe-991d-4193-9b68-417232fd266b/kisob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d2c7da2-35ed-4115-b74c-53a205e0b981/how_to_ask_my_girlfriends_dad_for_her_hand_in_marriage.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_off0000f9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C7 5444 bytes
SHA-256: 8d23385b29b26b68769fb1c0d3cf41f9f8dc0d56db263d7a4f205fba0cca38e6
font_01_sfnt_off00010c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6B 11220 bytes
SHA-256: 64343b1349e3949ee963e93a757a21dfaf36ae3658d22a1d8c74b97c75744e15

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