Malicious PDF — malware analysis report

Static analysis result for SHA-256 658d657502fd4f2a…

MALICIOUS

PDF

87.0 KB Created: 2021-05-17 06:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 715a1050fca11998c372889e2b8bfb43 SHA-1: e0decfdf3533616046ab5b5366ffedaf96ff5883 SHA-256: 658d657502fd4f2a215675ca89572fc6ff05b89b751759558ce49d1f9f66b2b2
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous external URLs embedded within it. The presence of multiple disposable hosting links and UTM parameters suggests an attempt to manipulate search engine results or direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/strik?utm_term=7+principles+of+systems+theory PDF link annotation
    • https://cdn.sqhk.co/giwumazusew/iejjgjc/pepeta_nora_fatehi_song_download_mp3_pagalworld.pdfIn PDF document text
    • http://asta-stroy.ru/48472502103i26bm.pdfIn PDF document text
    • http://ergors.space/consignment_account_questions_answersgvcuq.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxiwugo/aNhaidE/55577279348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kovilowab/android_emulator_google_play_services_are_updating.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_f25b53e81e4f430e80eee42829c1b527.pdf?index=trueIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_a2162513dab4422fa3896f9a7a1250d4.pdf?index=trueIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_46a832d240844ab2bf70d3fb03ac94b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7647348-6557-4d11-a6d3-ed7cb91afbc3/79225249084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de8f01c1-8203-4832-890a-2b02eec1dddf/jejojelitulepavajuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11689a5-5bab-4250-99bd-aa625f7ab890/death_cure_ending_book.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/rozukunozebuwaferelofo.pdfIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_f2c2393be0c3437fa5a8d9da246f648a.pdf?index=trueIn PDF document text
    • https://200ee3fc-349d-4871-b5c3-2c1c69b60476.filesusr.com/ugd/7b00a0_08a4004ab37943389cb6d379658172ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/32002867112.pdfIn PDF document text
    • https://4bd9ed84-c80b-4837-bb2f-b1353ebfd8aa.filesusr.com/ugd/5a1791_1d0a9c4ad9d244caa2c41e46e67eea66.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000120b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x120B3 19472 bytes
SHA-256: 4c03b07b2a32c8f5e5072f64367f0b62b450fc7ab09ffedef5d1f8c73b578c3c
font_00_sfnt_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 4920 bytes
SHA-256: fca715410b2dd1943a3bc0edf0baea4c20e9b920fc30c33a089bbbefa42ac3be
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 10104 bytes
SHA-256: 10eae7245d90cd3d6cbc06656903081856573222fe2d43f7c6a8c69bb7bc2de8
font_03_sfnt_off00013fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FD1 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c