Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f506d7d5e0622f…

MALICIOUS

PDF

72.6 KB Created: 2021-03-29 00:35:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: f9a7971eb95557e22f9ea6a61825eb40 SHA-1: 95374085b490697a9359f0d329a7340c5be18eed SHA-256: 74f506d7d5e0622faf6da2a2e0aa5a831e14882228950a78761cb08c1de78f96
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the structure of the PDF point towards an attempt to manipulate search engine results or lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=pdf+accessibility+checker+pac PDF link annotation
    • https://zeleveruki.weebly.com/uploads/1/3/4/8/134898901/vamuxeraje-tekawevefuv-woxoxewovazex.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/7f7946a54391254.pdfIn PDF document text
    • http://napanawojezej.iblogger.org/brainstem_anatomy.pdfIn PDF document text
    • http://jebifawulu.mywebcommunity.org/vetowutobupufesulolikiboz.pdfIn PDF document text
    • https://nuguserofaj.weebly.com/uploads/1/3/0/9/130969707/roragozogironi-nekofajotapil-zumunagupifowuf-zawusi.pdfIn PDF document text
    • https://mizojomi.weebly.com/uploads/1/3/0/9/130969452/35d08f0a2dea.pdfIn PDF document text
    • https://bativazuwa.weebly.com/uploads/1/3/0/9/130969541/02cb18fd21d20ef.pdfIn PDF document text
    • https://dezipozapuxel.weebly.com/uploads/1/3/4/5/134595234/b83bb9f73.pdfIn PDF document text
    • https://nujusokomofevak.weebly.com/uploads/1/3/4/5/134503883/079caad7608c2f.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/b5578ebd-670a-4915-a6a2-53db161d2cf2/83769201348.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/whirlpool_cabrio_dryer_parts_lint_screen.pdfIn PDF document text
    • http://tizexazebubo.atwebpages.com/what_is_service_of_process_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/96340258230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a01ec0a-c3f0-42a5-b9aa-f0f1b8591177/crazy_love_lyrics_michael_buble_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb9f4c02-ccb9-4c14-a942-bda3a3f70109/vegijozid.pdfIn PDF document text
    • http://xubevudedugo.epizy.com/74454424347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fed154e-6d41-4904-bc76-513ac2b04724/how_to_play_music_through_parrot_ck3100.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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 5552 bytes
SHA-256: 07b97d9e7ce8630cb3a6b3637c5cf39fc563679558119a9af91b6ad0feb1f237
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 10476 bytes
SHA-256: d31fbed5268a8d4a3f22adbf6440c4a9dc4aafae6821b1ae511c74a79bded52b

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