Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4f52ac88de06221…

MALICIOUS

PDF

70.3 KB Created: 2021-04-26 02:00:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ad5dd2504bec6269fde21ec94cf24aa5 SHA-1: 1d44140f8d53faa8e216d25a1ebbe752eff90b48 SHA-256: d4f52ac88de06221ac24f8b9998e953de11151725f0d70c35288e8bc70cdcde3
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The heuristic firings and numerous embedded URLs suggest the document functions as a lure, directing users to external sites, potentially for phishing or malware downloads. While no scripts were explicitly extracted, the PDF structure itself is being leveraged to host these links, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://jacksth.ru/strik?utm_term=whirlpool+gold+ultimate+care+ii+dryer+door+switch PDF link annotation
    • https://cdn.sqhk.co/terisuzuji/dtjcUid/five_nights_at_freddy_s_toys_lego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459182/normal_606dcea7adcbb.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/65576606958.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/xggheij/word_crossy_cheats_level_911.pdfIn PDF document text
    • https://nipixosawapur.weebly.com/uploads/1/3/1/1/131164079/26da7624d033482.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448719/normal_600398ce6091e.pdfIn PDF document text
    • https://rolorizumi.weebly.com/uploads/1/3/4/3/134316308/nijewu-vuvapuxa-jutet.pdfIn PDF document text
    • https://cdn.sqhk.co/xipitufekaru/gjCdher/55883194422.pdfIn PDF document text
    • https://fibusiwuso.weebly.com/uploads/1/3/4/5/134510481/vowubiwumodiko.pdfIn PDF document text
    • https://pomixorum.weebly.com/uploads/1/3/1/6/131606605/derufilipoxibezodaru.pdfIn PDF document text
    • https://tadiseregofinu.weebly.com/uploads/1/3/4/7/134748358/8726406.pdfIn PDF document text
    • https://kixovomez.weebly.com/uploads/1/3/4/8/134868331/womunoloxariwupixa.pdfIn PDF document text
    • https://farazekij.weebly.com/uploads/1/3/4/3/134379469/2a4380fd79a.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/d2iItAs/slam_dunk_2015_line_up.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/5d7acd2a-4de8-47a9-a78a-51a3e5c9086b/list_of_machine_learning_algorithms_in_weka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/163ca914-91c8-41cb-a6ef-11168d500e09/jatogo.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/55546104962.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/184edee8-6616-401a-a56d-1a31dcac6c4d/wizard_sewing_machine_models.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bdddee9-9227-45f5-9f7a-6a3263e3a540/36065207537.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_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 5696 bytes
SHA-256: 2fbfd41dbfa31c49c69bf5b4495f9dc3a8088920e92ae4b2f949b3fd5270876f
font_01_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 10796 bytes
SHA-256: ca8b54e16d6327d0d7f5a757eb42bfade8c8e276b53f41f4f0d52a4a45f79981

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