Malicious PDF — malware analysis report

Static analysis result for SHA-256 756aefd6c8572636…

MALICIOUS

PDF

77.4 KB Created: 2021-04-11 03:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1f11a0a270d1139e6ec16c91e15e3926 SHA-1: 385d238c9ebafb83bbe090d465737885a4d96b7c SHA-256: 756aefd6c85726368ce5ffecae645457227683f7268d56c5bb18dd1705bdc8da
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on disposable domains, with numerous external URIs pointing to potentially malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=ruckus+where+to+buy PDF link annotation
    • https://cdn.sqhk.co/tidelefuzin/idahgjj/pajizota.pdfIn PDF document text
    • https://cdn.sqhk.co/xakelafu/eS2jfXd/24915454378.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/hw9hghh/62348442552.pdfIn PDF document text
    • https://cdn.sqhk.co/xakalodesi/EPQmahj/buduwuzagomanapevijujil.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/que_es_la_atmosfera_terrestre.pdfIn PDF document text
    • http://brosbass.com/79831586541rfinx.pdfIn PDF document text
    • https://cdn.sqhk.co/kipasewimoni/ejehcgf/basketball_free_throw_drills.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/hjgcMha/carx_drift_racing_2_online_download_pc.pdfIn PDF document text
    • http://wide-mean.top/warframe_cellule_orokin_farmwas8k.pdfIn PDF document text
    • https://cdn.sqhk.co/kawiwitifa/hijahjF/depetowegidiferidenipefev.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/IMciehi/fibakabakegodorudagurax.pdfIn PDF document text
    • http://xuzazijup.22web.org/a4_mm_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/dizoketa/iijbY9f/gopozufali.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gimokoso.epizy.com/autumn_leaves_hd_wallpaper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7fb475-4ab2-4739-84d4-27cee220cb50/alesis_3630_review.pdfIn PDF document text
    • http://bepujegixu.epizy.com/applications_of_blockchain_technology.pdfIn PDF document text
    • http://pepebejawu.epizy.com/tubelanobobevazamepazam.pdfIn PDF document text
    • http://jetotajasavesi.atwebpages.com/lofepujamamexofabakuj.pdfIn PDF document text
    • http://sawezigulafufa.epizy.com/bobatoxilil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/762316aa-52bb-41cf-9808-1333faaa3476/duloxaloripaxesitaxogolaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9019b61f-ade2-4783-b230-fea0a5c738fa/kasugo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb220fea-4f90-4978-bdf3-0da7000e9674/bob_stroller_car_seat_adapter.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEB 5052 bytes
SHA-256: 4946011651f065ea3843ec67de9d1172e0ec436256340cd70efd6d89fa2a279e
font_01_sfnt_off0000ee34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE34 10592 bytes
SHA-256: 7f5399b833f30bb04b62f64d1b4a4b463513b9258d0e292b41ed3664bc7e530b
font_02_sfnt_off000112d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D9 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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