Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca59ab525e7d85cb…

MALICIOUS

PDF

62.0 KB Created: 2020-11-18 19:54:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a62bd7c7ba9af16c2a657952891df3c7 SHA-1: ead7c32ecc2299f56a79cd71a250df48f7ea3f84 SHA-256: ca59ab525e7d85cbceb9b6cc6ce95543f8e0a8d23ef578cdfd811f4e252ee217
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm or phishing attempt. The embedded URLs point to various PDF files hosted on external services, likely intended to redirect users to malicious content or further stages of an attack. No scripts were extracted, but the PDF structure and numerous external links indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffi.ru/123?utm_term=spirit+rock+monday+calendar
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f90a84f59127.pdf
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/rugujufujonefa.pdf
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5fb558ed75d95.pdf
    • https://cdn-cms.f-static.net/uploads/4377647/normal_5f95b2b747e1f.pdf
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/vokelunewej_wedezeregen_lejofe.pdf
    • https://gilolubirej.weebly.com/uploads/1/3/4/3/134309297/pozixeduropas.pdf
    • https://cdn-cms.f-static.net/uploads/4413705/normal_5fa56c14eb941.pdf
    • https://vavirewafikeja.weebly.com/uploads/1/3/4/4/134402836/4f69e72a23732d.pdf
    • https://pinosapop.weebly.com/uploads/1/3/4/1/134131344/vefonetesevekud.pdf
    • https://ligekikisi.weebly.com/uploads/1/3/4/4/134492932/xozorosurosati_sufununab_zolaxazum_ximufukifetodex.pdf
    • https://mepuzorow.weebly.com/uploads/1/3/4/5/134500467/6276bf03d4ff0.pdf
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/fubojaputiwitix-lixamewereleja.pdf
    • https://cdn-cms.f-static.net/uploads/4372378/normal_5f9cc44b9a89d.pdf
    • https://cdn-cms.f-static.net/uploads/4451752/normal_5fb2a545337f2.pdf
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5f9073021420f.pdf
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/1350692.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9119a822-5d8d-4fda-b329-fb3a24d2d5f9/42831682.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7b2.bin
c6eeb6a911ce5b33c3c226c9badba27888c3ba8c3df6335cfa3fc3dcd5739dcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B2 5308 bytes
font_01_sfnt_off0000c9b9.bin
6aeb4e264ce69ef48ff6165f38469070e188c33d3c1927c81833eebf3efe2a69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 9832 bytes

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