Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cae87d24184eb61…

MALICIOUS

PDF

75.4 KB Created: 2021-02-17 15:53:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e9230d40da3136918025e2b0ef8b2347 SHA-1: 9663159bab86b4d6bac10f3803ac1e23d0aef370 SHA-256: 6cae87d24184eb61da9d1405cdc8fd4a818e6a9d5d50360a05ff2b17214629ed
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to act as a deceptive gateway to other malicious sites.

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://baarspo.ru/aws?utm_term=por+que+o+ingl%25C3%25AAs+%25C3%25A9+considerado+a+l%25C3%25ADngua+franca PDF link annotation
    • http://vzale.ru/55271013903khm7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_601a62a738cfa.pdfIn PDF document text
    • http://halfraire.xyz/pisosewuwrnpu.pdfIn PDF document text
    • http://copyrightshelpscenters.com/regikumao70.pdfIn PDF document text
    • http://armlur.space/lego_star_wars_xbox_isohueb7.pdfIn PDF document text
    • http://espaceabonne.com/download_drift_x_burn_mod_apkcye35.pdfIn PDF document text
    • http://werenntaq.online/cam_icu_flowsheet_deutschghnaq.pdfIn PDF document text
    • http://bet-info.ru/9174043265smjn2.pdfIn PDF document text
    • https://tositoda.weebly.com/uploads/1/3/5/3/135312816/e35b3ce347d6.pdfIn PDF document text
    • http://sparzha.club/24052299508dvr4h.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/c4804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408862/normal_60236e3732d59.pdfIn PDF document text
    • http://canonsburglake.org/xodozitalodojanajapjuygt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5ff98701898be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45D 5664 bytes
SHA-256: 83e752597144cbf80ebe17aacd829961f85abb6130d889eebdf801993b7dc6a6
font_01_sfnt_off0000f715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF715 12952 bytes
SHA-256: 9ac6358c5891023d952ae351f933285924068e57f9a1f04c6694dd2867833838

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