Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd4f91c5f729acce…

MALICIOUS

PDF

71.0 KB Created: 2020-11-21 15:25:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64237b2d7cd7fa886477024f8a5f6649 SHA-1: 5485d6b3d0c9296ff52d47623d52d1e3e286fefb SHA-256: dd4f91c5f729acce9c900f7fd92a6e8a38eeca899c4772a416a1af5f71072ed0
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector and others forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains fragments suggesting search result lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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
  • 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://cctraff.ru/123?utm_term=light+bulb+changing+pole+lowe%2527s
    • https://vasogumodi.weebly.com/uploads/1/3/4/5/134593232/5cf6aa9a74af.pdf
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/fufumul.pdf
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5fb7e6dcccf0c.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/0c18874847f.pdf
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/03fb1a04.pdf
    • https://zadefiwexosufe.weebly.com/uploads/1/3/4/6/134634331/2801473.pdf
    • https://fobopogukigu.weebly.com/uploads/1/3/4/3/134366855/2145419.pdf
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5fa5999eda84b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/68c9d98c-497e-48f6-88f6-0b304df09eaf/the_secret_life_of_bees_download.pdf
    • https://uploads.strikinglycdn.com/files/13fb0c99-40dd-47e5-a590-2311b76773ff/9033272905.pdf
    • https://uploads.strikinglycdn.com/files/a43d1d6f-e604-405c-bd7d-0da22e585f90/fopisidapejufavotoj.pdf
    • https://uploads.strikinglycdn.com/files/c40d86bf-80d3-42ef-bff8-b17185bcd8fd/wedding_reception_script.pdf
    • https://uploads.strikinglycdn.com/files/c3261956-557f-4502-a9ac-16eb4052b2e2/sanonojukexitemumonet.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_off0000db47.bin
989c9d61e93f1dd0ebf6b84570b86e95bbb395a6c3af4f21adbead372759871c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 5308 bytes
font_01_sfnt_off0000ed76.bin
9b71fc92466a8775ca8ebd8b20b44d988967625739b9fb16e1ad0d18d5a2f3bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 10032 bytes

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