Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28f8fe91f7d92ac…

MALICIOUS

PDF

92.1 KB Created: 2021-04-16 18:23:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f49934dca0b5b7cefd6086c21bee0990 SHA-1: 53011752e12c474dd126563e01a9c865efa19d3a SHA-256: f28f8fe91f7d92acb896e0abe519cb14268b11c23233e565a7516e688b3897e2
126 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 high likelihood of malicious intent. It contains multiple external URIs, with a primary suspicious URL being https://jottigo.ru/strik?utm_term=ruger+sr9c+recoil+spring+weight, which is likely used for phishing or to serve a second-stage payload. The document body, though heavily obfuscated, appears to contain keywords related to firearm parts, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=ruger+sr9c+recoil+spring+weight PDF link annotation
    • http://nevinidonet.mywebcommunity.org/relusudifip.pdfIn PDF document text
    • http://dakajak.medianewsonline.com/beef_cattle_production_in_the_philippines.pdfIn PDF document text
    • http://wofixizufiw.22web.org/61820709860.pdfIn PDF document text
    • http://jofefipibabalul.22web.org/kezevabofakuwemijo.pdfIn PDF document text
    • http://dazinifuxevoji.22web.org/dice_masters_dd_tomb_of_annihilation.pdfIn PDF document text
    • http://rivafigikiwax.medianewsonline.com/94978223096.pdfIn PDF document text
    • http://runibefulamad.22web.org/guminidonagaviduxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://webexopate.rf.gd/buxesulufinepobasut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6057a84e-813b-4bce-bf22-6e3e8b3c948c/42434044565.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/wabeleg.pdfIn PDF document text
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_b9d73a5753d54dd5941a76820a4c68e3.pdf?index=trueIn PDF document text
    • http://milisepidug.rf.gd/metodo_analitico_o_pormenorizado.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/35657998685.pdfIn PDF document text
    • http://dasowarixolusix.rf.gd/canmat_bipolar_ii_guidelines.pdfIn PDF document text
    • https://4407eba0-147d-4e9d-98ff-19010b67f466.filesusr.com/ugd/c1f2fd_041626c6e95a41bc97aa4df686de13ec.pdf?index=trueIn PDF document text
    • https://9e7b01ce-91ce-414a-93c5-ade8df4b7359.filesusr.com/ugd/cfbfd2_b9f1fd4aee8a43b6a48583d4ebb3ccaa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ed249aa-4624-45de-bfd4-87920d0aa3b3/xovebofegabajotakegedigi.pdfIn PDF document text
    • http://levurugagizov.rf.gd/pajidadamisa.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_4818e3d5bff54ffab09eecb82c96a716.pdf?index=trueIn PDF document text
    • http://niselasot.atwebpages.com/anganwadi_form_download_mp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f403ab1-0f07-4d80-8933-ea4220747c6b/12407160694.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/brochure_making_software_for_android.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_off000127c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C8 5240 bytes
SHA-256: 15f8c548e83cef76c154cc9cf2c3e74ca23f8cef407ff5fbf1da06751b06b598
font_01_sfnt_off000139b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B7 11652 bytes
SHA-256: 0308f9c6fd3733a2c6192473578b34394ec58721fe34826eade2cf770b80a5c0

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