Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cceb8459dad78c…

MALICIOUS

PDF

75.5 KB Created: 2021-02-27 22:48:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 3a02c430af0a34991cd7cb6070fc3279 SHA-1: 268d9f7e016ff7bfaae894c7bf1664279b6669f9 SHA-256: 55cceb8459dad78c8a0ac7ed962a45c3722fc5825a886a76cf2c42a664feb9d1
224 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure. The ML classifier also flagged the document with high confidence. The presence of a 'Password-protected archive handoff' heuristic suggests the document is intended to trick the user into providing a password to decrypt a malicious payload, likely delivered via one of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://dafemum.ru/aws?utm_term=curso+tecnico+o+que+%25C3%25A9 In PDF document text
    • http://rodsfish.club/gedung_play_apk_modxvh3q.pdfIn PDF document text
    • http://testvvd.xyz/john_travolta_bubble_boy_images5noka.pdfIn PDF document text
    • https://cdn.sqhk.co/masamiwe/ighdPhd/3042548129.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/eemo9gd/business_administration_and_management_courses_in_kenya.pdfIn PDF document text
    • https://gagejewepaji.weebly.com/uploads/1/3/4/4/134444149/zujasadelixane.pdfIn PDF document text
    • https://tojejalunegod.weebly.com/uploads/1/3/2/7/132710717/e00637c4b96.pdfIn PDF document text
    • http://bet-info.ru/kefozudojolepuvebovoneo4a0n.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/kane_chronicles_book_1_graphic_novel.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/which_cuisinart_air_fryer_is_the_best.pdfIn PDF document text
    • https://cdn.sqhk.co/nebuneduzib/5KoYhhn/37677973888.pdfIn PDF document text
    • https://kaxitojuwomig.weebly.com/uploads/1/3/5/3/135302818/1449136.pdfIn PDF document text
    • http://0fruit.space/cccam_checker_apk2lm6w.pdfIn PDF document text
    • http://lazategomid.scienceontheweb.net/wugode.pdfIn PDF document text
    • https://cdn.sqhk.co/seduregudire/ohajbgd/facebook_logo_2019_for_business_cards.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/zabevog/raxoxaxotefiti.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/aegis_vape_mod_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/driving_home_for_christmas_sheet_music_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/sudden_sensorineural_hearing_loss_treatment.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_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 4724 bytes
SHA-256: f23bd343a4e5e735edd29242e789d0934eb7946f19b485b80a3e6ebff7513638
font_01_sfnt_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 12660 bytes
SHA-256: 8553fc65fb9229bdac75dabafda8cee3a2f8741de444c6084fa70e9ced0ca89f

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