Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4e37492ded80f8…

MALICIOUS

PDF

80.6 KB Created: 2021-04-03 19:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8208674e5233777e549b3dc81779e4ae SHA-1: 7cea01504268e087eb2b71b2402458dcda02bdda SHA-256: 4b4e37492ded80f884b207ae2bbd4a3a44b0562c537f4385a73f34eb6f235c46
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are generated SEO-style links pointing to PDF files, indicating a link farm. One of the primary URLs, 'https://resalured.ru/123?utm_term=moto+g5+plus+upgrade+to+android+9', suggests a lure related to mobile device upgrades. ClamAV and ML heuristics confirm the malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=moto+g5+plus+upgrade+to+android+9
    • http://gebuhrenfrei-mein.com/94765074916vh3sy.pdf
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/4740690.pdf
    • https://cdn.sqhk.co/vufisolepu/UhhcMgc/old_pc_keyboard_port.pdf
    • https://cdn.sqhk.co/raserijene/ccShehd/sigukumetebenav.pdf
    • http://easylearning.space/2004_honda_rancher_350_tie_rodd8r6p.pdf
    • http://triple-doska1.club/493896738788rqzg.pdf
    • https://lafazomutege.weebly.com/uploads/1/3/0/7/130740298/9392631.pdf
    • https://cdn.sqhk.co/bimonabozo/hiLhfjj/covid_19_pandemic_wikipedia_philippines.pdf
    • http://wekeb.space/ver_soul_plane_espaolwhcdt.pdf
    • https://cdn.sqhk.co/sadudolamom/hOr9jnp/twilight_struggle_asia_scoring_card.pdf
    • https://judupivaruva.weebly.com/uploads/1/3/0/7/130775992/3703949.pdf
    • https://kunugamonigosa.weebly.com/uploads/1/3/1/8/131871761/mogesurevisetot_mosesixof_kojiguporikeze.pdf
    • https://cdn.sqhk.co/mowaxuso/jgyQjgC/zejabunigilenuli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ccf353f5-ccf2-4cd3-b447-ba94cfd876cf/what_is_the_most_accurate_powder_measure_for_reloading.pdf
    • https://uploads.strikinglycdn.com/files/062c068c-b001-419b-9e52-4d459713993f/gimaluvupazeseponuk.pdf
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_3ec9387857fa481da6ad391255a3aa11.pdf?index=true
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_86c0733e4c9a4b82aabb8c75eedf97cd.pdf?index=true
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_fc0b912e702941249e0caa44cc2bd923.pdf?index=true
    • https://a22cca75-cc8f-459c-9eea-628147015b55.filesusr.com/ugd/2f8a36_01e8d7d661464759b1e8868f5db2c52f.pdf?index=true
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_0cb7727092314e12bddf7bb863109245.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e2159c86-2404-47f1-89c5-a3b0358d814b/tumosesexuzopa.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa70.bin
666551fc2400c5ce917e7a90b228f541dcf234d33ef8a4462ee9e41ff67b8fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 5412 bytes
font_01_sfnt_off00010cf1.bin
65d22af082cf3233813aeb6598f38c582d121acc10a45c780a441afbbb062e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF1 11688 bytes

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