Malicious PDF — malware analysis report

Static analysis result for SHA-256 8368cfbca669064c…

MALICIOUS

PDF

89.3 KB Created: 2021-04-03 13:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 94e509d5c7c98cf8a425bb000bee95d5 SHA-1: 211d7aef1c577d0ab4928649c9d69a56418fdeb0 SHA-256: 8368cfbca669064c762140d28caf848cd8ce83727121f83e3db3e24cd6013b4d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://zajinet.ru/123?utm_term=bahut+khoobsurat+ho+tum+lyrics PDF link annotation
    • https://cdn.sqhk.co/vakenuda/ajiijid/20981605001.pdfIn PDF document text
    • https://cdn.sqhk.co/xozifejor/ihcPiez/78905031044.pdfIn PDF document text
    • http://masterpowerpoint.com/pegalibibuven3f80y.pdfIn PDF document text
    • https://dorijalasenotom.weebly.com/uploads/1/3/5/3/135327318/0fee82dc1ae93c4.pdfIn PDF document text
    • https://dapemoko.weebly.com/uploads/1/3/4/6/134647299/baweveguxegezuxelul.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/ihCiahb/zombie_slayer_jinx_wild_rift.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/SKkdpoo/mobile_classic_car_mechanic_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/loxopudizus/how_to_do_conversions_in_organic_chemistry.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/bonjour_for_itunes.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/can_i_join_delta_sigma_theta.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/guzekinafanadap.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/can_you_use_sweat_app_on_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/sex_and_the_city_2_trailer_italiano.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/teaching_grammar_approaches_and_methods.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/how_to_use_digital_multimeter_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxegu/what_is_heavy_dt_crossfit.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 5396 bytes
SHA-256: f559daf2498097e700c6bd79d01a51c65abd1a74ebf11a52ab8431905e40db47
font_01_sfnt_off00010768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 11328 bytes
SHA-256: 51893896bad1a821eee142ad79f058aa063553a3b6f24935b8db61e7d71bea3a
font_02_sfnt_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 13668 bytes
SHA-256: 42dcf7303243974edd73f5071984dbef9dd9bc524f7a9e96df9311c422fd4328

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