Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec6b8a52470634d…

MALICIOUS

PDF

78.2 KB Created: 2021-03-29 15:33:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bc8337abc40a07cafafdbd811b7f1f37 SHA-1: f6a7b3f2c580411086d9898e307b6bf2456a4e42 SHA-256: dec6b8a52470634debb21aa86d4db9c4d26d94303ab46057d89d0897627136d4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least two pointing to suspicious domains ('druttle.ru' and 'raifaisentgo.online'), suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to PDF creation and keywords that might be used in phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/award?keyword=richard+bandler+pdf+free PDF link annotation
    • http://raifaisentgo.online/brandon_burlsworth_car_accident252hc.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/vector_product_physics.pdfIn PDF document text
    • http://korecos.ru/199118257424v2yy.pdfIn PDF document text
    • http://munupesifak.22web.org/vorajoxaxojut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_60221a56ee50b.pdfIn PDF document text
    • http://ufenmac.com/najemerelinakcqln3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382793/normal_5fd379460855c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufaxame.rf.gd/8771199833.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe334750-4c77-4098-8086-d9fc32b4f030/elements_of_poetry_powerpoint.pdfIn PDF document text
    • http://fuzadakeju.epizy.com/78837703212.pdfIn PDF document text
    • http://sajurewe.rf.gd/22184100109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f980a23-9fb9-4b07-95f3-17372a3ad59b/how_to_make_an_android_app_for_beginners_in_android_studio.pdfIn PDF document text
    • https://b36ad067-21ef-4b17-9055-1dfcbb3fb98c.filesusr.com/ugd/8673ad_81e68ebd98a940d49feb45cfd174e12f.pdf?index=trueIn PDF document text
    • https://1864c106-1a4f-4194-99fb-dabd5a0af450.filesusr.com/ugd/17b194_7b58e5782fc74a86873932283568ac18.pdf?index=trueIn PDF document text
    • http://ropigitapeda.rf.gd/melerunipopavemenubegoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a2fc4f-3ce0-48c3-bf1b-681c6a12e203/kerex.pdfIn PDF document text
    • https://591379ed-26d0-4405-baa7-5b8dadede013.filesusr.com/ugd/866ffa_11288c48e6df40d69cc283c116445c0f.pdf?index=trueIn PDF document text
    • http://molujafit.atwebpages.com/manual_lisp_para_autocad.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_off0000f547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF547 5212 bytes
SHA-256: 0e0973615953d38b5f42c03fd5d15be9b11eedd8097c239789168f3a45f697e8
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 10932 bytes
SHA-256: 8312eb8986ef2052a8315b9deab1044d600373b800eebd169e2d31603a7ad5e3

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