Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77fa615bec5b212…

MALICIOUS

PDF

95.9 KB Created: 2021-04-01 17:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: caff0192bed5497567531085c34adecc SHA-1: 7ceda11f5abed83aa99ff4fbf74a0cb02aacacf7 SHA-256: e77fa615bec5b212cfd11154771e2cfd3c3e17325f3b17355e625fbf62b4dab7
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, suggesting a link farm designed to distribute malicious content or phish for information. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect the user to malicious sites.

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 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/123?utm_term=clasificacion+japonesa+de+cancer+gastrico+pdf PDF link annotation
    • https://cdn.sqhk.co/rinulazopun/pwidUgh/ninja_revenge_will_rise_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/lididiregi/jToo4jU/rocket_race_car_team_umizoomi.pdfIn PDF document text
    • https://cdn.sqhk.co/lowilufape/hy2gihc/favov.pdfIn PDF document text
    • http://geekcods.com/denapuxivajudatejiwiv29xbz.pdfIn PDF document text
    • https://cdn.sqhk.co/xiditado/oajggim/bhavans_baroda_worksheet.pdfIn PDF document text
    • http://hellochildren.online/lessee_information_sheet_subsequent_filing78rvx.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/igfkphc/parents_as_first_teachers_program.pdfIn PDF document text
    • http://lepawarowupi.iblogger.org/46920068494.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sixolose/virijaz.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/cecotec_mambo_recetas.pdfIn PDF document text
    • http://feluwagosipo.rf.gd/sixinozipuvetewizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70e5cce5-d6e7-4068-99df-3011c7404a69/rowosazexikoxirege.pdfIn PDF document text
    • http://vufiferej.epizy.com/beep_codes_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8df5da8d-13b4-44c6-9e01-9b312f9c953d/teluvumemexi.pdfIn PDF document text
    • http://benifolagalat.epizy.com/how_much_is_wifi_on_allegiant.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/dugelopes.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/33091898951.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/pojusevezexaxokon.pdfIn PDF document text
    • http://lajuvinujako.rf.gd/moped_repair_orange_county.pdfIn PDF document text
    • http://bojorebeko.rf.gd/chain_of_distribution.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_off00013487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13487 5304 bytes
SHA-256: 6749e42dd4a2349f116e8d04b0d603227c673d8fba4ec2b617254a56fc6d9411
font_01_sfnt_off000146a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146A2 12740 bytes
SHA-256: 7798b93326cefe752af0f4abffbdd6371b8a00834d2eff083a22798881ab43d6

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