Malicious PDF — malware analysis report

Static analysis result for SHA-256 3436e6bc790fa692…

MALICIOUS

PDF

74.3 KB Created: 2021-01-05 22:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 784f3ce3c0bcc2278871426701c7b753 SHA-1: c8a7ee8405cad21f1911a786b0cca952933a4b84 SHA-256: 3436e6bc790fa6924b75552b0a7d583ebf50a761503ef668247dc96faeb2dcc2
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results or distribute malicious content. One critical heuristic identified a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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.
  • 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://ggtraff.ru/123?utm_term=revlon+colorsilk+reviews In PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5ff3d8c5e0b34.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/f6d6309e0f2985f.pdfIn PDF document text
    • https://xilizotuxepaxi.weebly.com/uploads/1/3/4/3/134309236/pakuzixefuwateki.pdfIn PDF document text
    • https://jeretidaker.weebly.com/uploads/1/3/4/5/134595905/wotopigurumuxow_tilinugawazakab.pdfIn PDF document text
    • https://lotagixowila.weebly.com/uploads/1/3/1/1/131164100/5651968.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/4f5cee.pdfIn PDF document text
    • https://bemiredo.weebly.com/uploads/1/3/5/3/135322707/6503358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_5fee422812e54.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/tibanepoxilibud/lalkuthi_bengali_movie_song_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/450df945-6ab6-4156-8ecb-f25388af5821/can_am_instruction_manuals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b057dd71-3e76-4e02-ae20-2e379016da7a/72885305783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d56823db-eef3-4991-9d12-c6886e3c60e5/amc_refund_request_failed.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/zisesugolubejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13f126db-bd47-4912-bcf2-064dbd83d409/buganiworibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edf782f2-b2c8-4498-834b-92c2d7765dca/85021680356.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_off0000e813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE813 4804 bytes
SHA-256: 001d5a93a76ffe9063f4200f25132b2a7ad3a1527be6df81256c5cc6fb82402b
font_01_sfnt_off0000f896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 10416 bytes
SHA-256: 9438ce55291588ccbc2d72ff4120a463b227f41133d9e9904f0e3f71bb6e8781

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