Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e325ccf96b4b81…

MALICIOUS

PDF

73.5 KB Created: 2021-01-26 11:21:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1967a9716ebe0b683269c8c97b995159 SHA-1: 7c259ae195f659f9d40a1ef1cb1865b9ea29c417 SHA-256: 84e325ccf96b4b81ca2c2abf9bd3d2c77399861490544cf9cded31ed2f27d648
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spamming operation. The document body, though heavily obfuscated, appears to reference popular media search terms, likely to attract unsuspecting users. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to malicious or deceptive 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://trafficel.ru/123?utm_term=kissanime+seven+deadly+sins+season+2 PDF link annotation
    • https://cdn.sqhk.co/remimidotomi/gheLkij/inditex_black_friday_2020.pdfIn PDF document text
    • https://gadakuvinud.weebly.com/uploads/1/3/1/8/131871823/939383.pdfIn PDF document text
    • https://tibufidis.weebly.com/uploads/1/3/0/7/130740046/8329336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5fdf39d28facf.pdfIn PDF document text
    • https://cdn.sqhk.co/dedenijikal/hJbJ1oN/reverse_pec_deck_at_home.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/nLjhihb/ultimate_epic_battle_simulator_free_online_download.pdfIn PDF document text
    • https://cdn.sqhk.co/diwiporeb/lGZdhjS/download_ios_11_lockscreen.pdfIn PDF document text
    • http://kafikiwamavo.22web.org/majhinaukri_rrb_alp_answer_key.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://norilonabu.epizy.com/picsart_free_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/sowufirevekukirozuwutut.pdfIn PDF document text
    • http://zixadadafupeg.epizy.com/platform_bed_frame_queen_headboard.pdfIn PDF document text
    • http://lanikudawojag.rf.gd/free_movie_bajirao_mastani.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/motor_vehicle_accident_report_form_ontario.pdfIn PDF document text
    • http://folujas.epizy.com/47722103573.pdfIn PDF document text
    • http://sojopisosifa.epizy.com/brent_ozar_first_responder_kit.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_off0000e21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21C 5140 bytes
SHA-256: 242d9e339f1c6691b0806e01b14ff78bf8b49062054f036f021a129372443b21
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 11068 bytes
SHA-256: f34f4a80b8e2c5b74344891feb45a27e6ca455cbe7013572c8f7beeade3df385

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