Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8f145104d1786f…

MALICIOUS

PDF

76.4 KB Created: 2021-03-09 06:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 123c34b7f21ca6ddaa231afafc64404b SHA-1: 758d46514cacc2ada5f48837357b22a80b96f455 SHA-256: 5e8f145104d1786f14fdb095e18360ef3d49e2c3cc9717bf6d2db34162e8d0c8
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable domains and employing UTM parameters, indicating a link farm designed to lure users to potentially malicious sites. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://midufefew.ru/strik?utm_term=does+kwikset+916+work+with+alexa PDF link annotation
    • https://rinezafuwokof.weebly.com/uploads/1/3/1/4/131437641/ludunul.pdfIn PDF document text
    • http://cleanup-sale.site/62887737143jv4ye.pdfIn PDF document text
    • http://sparzha.club/fexibidugaxezuvigugv5om.pdfIn PDF document text
    • https://noxigizafovezad.weebly.com/uploads/1/3/1/4/131438329/mewetobowopuka-ronejamite-lajef.pdfIn PDF document text
    • http://olymp-trade.top/ceza_hukuku_genel_hkmler_pratik_alma_kitab0h787.pdfIn PDF document text
    • https://jegofedakosufe.weebly.com/uploads/1/3/5/3/135320490/54686e7dd68ff.pdfIn PDF document text
    • https://fedebeforejasu.weebly.com/uploads/1/3/4/4/134498020/noganumotugidu.pdfIn PDF document text
    • http://patolul.iblogger.org/the_cars_drive_sheet_music.pdfIn PDF document text
    • http://price-list.moscow/comcast_cable_reference_code_s0a00id4n1.pdfIn PDF document text
    • http://bojukekaj.66ghz.com/45915039659.pdfIn PDF document text
    • http://remont-kvartir-otzyvy.moscow/latest_update_avast_antivirus_free4o8tq.pdfIn PDF document text
    • http://lamorebeduzakoj.22web.org/39386069346.pdfIn PDF document text
    • https://bujasosepamus.weebly.com/uploads/1/3/4/6/134626994/8574796.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/5166e003-3952-439d-a6d8-c699a3ecc290/bigger_leaner_stronger_workout_4_day_split.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/666c52b9-bc8d-42fd-9ff1-8f715a8388da/transformational_leadership_definition_burns.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_8f730f66cd354b8797e7a6bf66ccbf13.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87f0a75-385b-4bf5-b7f9-3200582f75c9/12115264753.pdfIn PDF document text
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_73261061420a4b7fb56e6c00f00e40c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/233fff69-3717-4ee3-9d82-13d2e176ddea/briggs__stratton_625_series_190cc_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e54dd71-1465-45d1-8885-97203a045830/fuxox.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_63b73e67e22d471ea6c7ddb2e8305746.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9b65d25-366a-410a-96b8-d0e7540085ac/firehouse_small_italian_sub_calories.pdfIn PDF document text
    • https://a50dbba5-e4fd-40cc-afa9-a45495a5accf.filesusr.com/ugd/7f929b_86afb63fa85d4aa8b2c489c2a228a1b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c224891d-4280-4915-abe5-215a87203bdc/sosurejuluworodisutuwib.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_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 5356 bytes
SHA-256: 7426faeda55388fa8b390b263974fa6950f5c8f02f1addc6a9b9bb3f00844240
font_01_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 11956 bytes
SHA-256: 9281e0712f7965b603df0f0255633e15fcd81a030f05a59c5d80bae45e39c4e0

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