Malicious PDF — malware analysis report

Static analysis result for SHA-256 46aee7c733c990db…

MALICIOUS

PDF

82.1 KB Created: 2021-04-01 14:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98f4f1852a182d0bfffafcd6bf345df2 SHA-1: 0f0b3027e255e5082fac19d3bf676b356c0b4d26 SHA-256: 46aee7c733c990dbce99da1736869c42ccb18ca6e0991b196949544f122749c6
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or phishing lure. The document body contains a deceptive title related to taxes, likely to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-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://pelibifir.ru/aws?utm_term=are+our+taxes+going+up+in+2021
    • http://frankiearvelo.com/77024020338rp4jf.pdf
    • https://static.s123-cdn-static.com/uploads/4503524/normal_5feef294c33ed.pdf
    • https://static.s123-cdn-static.com/uploads/4449172/normal_5fc770a5a591b.pdf
    • http://mp4.design/buy_the_golfing_machine_booklkoce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xufujofaleki/dragon_city_breeding_guide_gummy_dragon.pdf
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_cf490bac08694793a61cd73e8368144a.pdf?index=true
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_5aa2c3da1efa44f09cf9f107c84f2077.pdf?index=true
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_d42da1c437354b49b960da87e61c8491.pdf?index=true
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_8404dddd0f734219a58748c863da890f.pdf?index=true
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_5b54efaf512a4d389f5b8adba9f95026.pdf?index=true
    • https://uploads.strikinglycdn.com/files/db00bcd1-cc7e-42fe-8f5c-4427d3aa2f43/nombres_de_dios_y_sus_significados.pdf
    • https://uploads.strikinglycdn.com/files/d2b93171-fb97-45ba-9cd3-f4c28904598b/what_is_document_no_in_driving_licence.pdf
    • https://uploads.strikinglycdn.com/files/3c3896cb-590b-4474-8504-4a736b03c292/juraxinox.pdf
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_2ee63fdfde2a43c6a85b68ab56397591.pdf?index=true
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_06dd3964e51445d5b93483d63598d8f6.pdf?index=true
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_a1febc55cba1498485d220f443fa227a.pdf?index=true
    • https://s3.amazonaws.com/lorerexeg/pride_and_prejudice_2005_movie_with_english_subtitles_free_download.pdf
    • https://36fde204-cda4-4268-899b-58717f9005d0.filesusr.com/ugd/b13063_37cb299365fd46938a6ef89c09c47805.pdf?index=true
    • https://s3.amazonaws.com/lezerawe/bawunugev.pdf
    • https://uploads.strikinglycdn.com/files/c7c9102c-7498-423d-add0-87318221efbe/mexinifekizevujanos.pdf
    • https://s3.amazonaws.com/xugigabitulu/18465186266.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_off00010216.bin
575c7f0ed5fd266557452602cc5fcf970b75b2a138efb0ac62d988fd919df7ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10216 5336 bytes
font_01_sfnt_off0001145a.bin
7e53131700543b682c31af53bf0f174ee3affc5d9c0d7a087ee52917eb5072fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1145A 11312 bytes

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