Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbb1a566341e44ad…

MALICIOUS

PDF

68.5 KB Created: 2020-12-31 14:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 451292fea4092bb6f56e85fc26c67f15 SHA-1: 7237a3b5752abaf2424792163e166e21afcf643e SHA-256: dbb1a566341e44adb837f2091221fff891f5792163267e71b5dcca895c84540e
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on disposable domains. The primary purpose appears to be SEO manipulation or the distribution of further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • 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://traffset.ru/strik?utm_term=lyrics+dreamer+supertramp+ubersetzung
    • https://gilinolejokakis.weebly.com/uploads/1/3/4/6/134632374/pepisesev.pdf
    • https://fusefediwotedi.weebly.com/uploads/1/3/4/5/134589876/2fa6e4.pdf
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/8801025.pdf
    • https://mufogijagojar.weebly.com/uploads/1/3/1/0/131070489/rewadab_dapineropo.pdf
    • https://cdn.sqhk.co/gadukupuwe/wggaccj/zalizose.pdf
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/joxovezexem-waxegusomukefa.pdf
    • https://taxamoxegira.weebly.com/uploads/1/3/4/8/134895948/2199797.pdf
    • https://zirovosenes.weebly.com/uploads/1/3/4/3/134316706/7582308.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/01cc20de-c0fd-44b6-a7c9-aaf9fdbe613e/98565979979.pdf
    • https://uploads.strikinglycdn.com/files/e20bd964-2fd6-4935-b128-5948d9b5505c/lujalilukulaberibe.pdf
    • https://uploads.strikinglycdn.com/files/ee3a759a-35b9-4c67-a4d4-7252d523deb4/98996087834.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb33.bin
21eb97b4e450d9294c66a6e1a6bec9f69186dcb0db7b8c2bbfe3db820e5838f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB33 5592 bytes
font_01_sfnt_off0000ce31.bin
81f10f60760b5e8f9d666714355ff8e8f8d7b646236291db67d0ed53d3a892c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE31 10028 bytes
font_02_sfnt_off0000f04d.bin
f469c5aa689aa4c1965481b78cfaebbf1c3ebdad2306c7067134b7b4aaa0addd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF04D 16164 bytes

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