Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae8f7a55065b0a98…

MALICIOUS

PDF

77.3 KB Created: 2021-02-27 16:38:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 886ed39417382202e2e3fc20cc6b4003 SHA-1: ade323c651d8baa84d2d2c622f130b712a81e19d SHA-256: ae8f7a55065b0a985d636e832244cedddf7da2f567aff5fa179a8996a75d6035
126 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or link-farming operation, as indicated by the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous external links pointing to disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or to harvest credentials. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/wix?keyword=mindi+wood+dining+table PDF link annotation
    • https://cdn.sqhk.co/ketejeti/aMbij2a/89220190574.pdfIn PDF document text
    • https://cdn.sqhk.co/kawaniroti/idxbvgg/spiral_lighted_christmas_tree_green_lights.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/to_kill_a_mockingbird_review_packet_answersmsodp.pdfIn PDF document text
    • http://azakalaza3.xyz/rinudelovonitekezasiwu3kwvp.pdfIn PDF document text
    • http://jumpfs.space/14188249436wdtlp.pdfIn PDF document text
    • http://segway-wheelchair.ru/free_cool_powerpoint_templates_designcsxr9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5fcf4c015979f.pdfIn PDF document text
    • https://cdn.sqhk.co/fixijolexap/UhfhhAz/athletic_apparel_brands.pdfIn PDF document text
    • http://topstop.site/lotelotejegudo47x8.pdfIn PDF document text
    • http://pagebake.com/flow_cytometry_basics_for_the_non_expertot4xj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_60329094d4742.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwosagamivi.myartsonline.com/jutiv.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_off0000f2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F7 4956 bytes
SHA-256: 8571ebb3cded4fba3213abd152612e7e4078854d54f7576fb7f4dc3bd3033c6e
font_01_sfnt_off00010406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10406 10704 bytes
SHA-256: fd102115f6826a006b1184d0b4cfe29e93140fec6e92de8d4a0f6577145435a5

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