Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd06f09a17d24bcf…

MALICIOUS

PDF

76.5 KB Created: 2021-05-28 11:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ca4266f3727d9f37f52a8b71b3b51f4e SHA-1: 233cf2df34c0f48e4169d2a7de7f72fa5d22eccf SHA-256: dd06f09a17d24bcfb7c80488433b54b05ed39ea3983d80b1c11ad7345458fe54
246 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It impersonates Apple to lure users into clicking a link, which leads to a link farm hosted on disposable domains. The primary purpose appears to be credential phishing, leveraging a network of redirectors and hosted PDFs to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/katisemu.pdf.
  • 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://druttle.ru/strik?utm_term=v+shred+app+not+working PDF link annotation
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/katisemu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450513/normal_604ccaab5ab88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479718/normal_601980978b121.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417213/normal_5fdde4fd9bc74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_602730a6a8575.pdfIn PDF document text
    • https://girosunemakafe.weebly.com/uploads/1/3/0/7/130739351/10675.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473049/normal_5fd67ae827045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_6013169b87b48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495858/normal_606227f4ee45d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_604373cdcd04d.pdfIn PDF document text
    • https://rufajesovulibo.weebly.com/uploads/1/3/4/2/134235528/falokatoba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485435/normal_601cd82b514f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379485/normal_5fcad60015a96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408720/normal_5fda679d5da1c.pdfIn PDF document text
    • https://tagojakiwuki.weebly.com/uploads/1/3/4/4/134444274/wuziv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_6011ec2e430a3.pdfIn PDF document text
    • https://vipagazowarofi.weebly.com/uploads/1/3/4/6/134685611/3999938.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_6025f5db60411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372696/normal_6050320bd5420.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/5747e225-0522-463f-b801-a9b07b9363af/douglas_county_school_district_calendar_nevada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdcf3c4c-a521-4e9d-8388-2950eb6e3dc3/star_wars_original_novels_canon.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_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 5308 bytes
SHA-256: 82e7632a6f316b986f791fcf2e9b68b41de31e034af1449b4620b1f3b368bf57
font_01_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 11240 bytes
SHA-256: d46995f1915f5fff007489c08877382fa8c4e5c6ef2a19c169b879b46ce2d0ba