Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de53770c91fee8c…

MALICIOUS

PDF

113.0 KB Created: 2021-03-25 01:57:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b457046d4810b033ec2d70cb68db7da0 SHA-1: b5c310292cbb2c6d2222a6fb39e10d27a4178e06 SHA-256: 5de53770c91fee8ceb6d5ff4963f16c48621ed13fc9f1630fd4a8208322a746e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=is+ponniyin+selvan+a+fiction PDF link annotation
    • https://cdn.sqhk.co/fixakozumad/Niehggc/jotisidamenurilatogexopo.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/gjjaOhb/rts_protocol_somfy.pdfIn PDF document text
    • https://cdn.sqhk.co/gapebeve/N5hhhid/4674703784.pdfIn PDF document text
    • https://momimuraw.weebly.com/uploads/1/3/1/3/131384495/titafamajol.pdfIn PDF document text
    • http://wagagawoduzom.iblogger.org/zuduvawan.pdfIn PDF document text
    • http://zawopim.mygamesonline.org/case_in_point_complete_case_interview_preparation.pdfIn PDF document text
    • https://xosebabonewita.weebly.com/uploads/1/3/4/6/134613761/1795431.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/93960114742.pdfIn PDF document text
    • http://babudategajuzul.iblogger.org/12534764324.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/1ifeCTJ/kirirowemezum.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn 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/32d2e917-2e9e-42b3-8467-43e7c89d2ff0/is_metabank_prepaid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7b1dc99-16b4-450e-8ead-09ca1da2e373/sodilatunosegibireduzaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa419bb-1ed0-4bf6-ba4d-0662d03f3fcd/kitchenaid_4.5-quart_tilt_head_stand_mixer_with_bowl_with_handle.pdfIn PDF document text
    • http://wijopimitiraze.epizy.com/3789819861.pdfIn PDF document text
    • http://garonidu.epizy.com/zuliludupakefiwizedujisub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96c932ec-2a84-4c6e-8b9d-e25801cf729e/is_planet_fitness_waiving_cancellation_fees.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99639f61-bb7c-41ee-8e95-92b30e985780/sony_ht-ct780_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c60127-5f73-439a-96db-99163f195724/arduino_board_manager_error_downloading.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a94f10-8983-46b3-b4a3-003f016e6ebd/sexazaw.pdfIn PDF document text
    • http://noxukimu.myartsonline.com/ielts_writing_task_1_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d79bb0b-f8ee-4804-93e3-77112628b02d/93165621232.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00015b4c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15B4C 12448 bytes
SHA-256: 2be145d8e708a39ccb46138305cb69fcb554f2dc53faade295c155ba17700fc6
font_00_sfnt_off00014a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A14 5012 bytes
SHA-256: 743800fcb283eb2e09fbb32b5cd9b724d7804049cbfb2de580629f49f1c9bc50
font_02_sfnt_off00017942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17942 11604 bytes
SHA-256: 6539953dc350ed21d8f3e57d6670165864894417c3836a3f161e691dc2a5662d
font_03_sfnt_off0001a0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0EF 16164 bytes
SHA-256: ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8

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