Malicious PDF — malware analysis report

Static analysis result for SHA-256 c927a0853d822a3d…

MALICIOUS

PDF

78.2 KB Created: 2021-06-08 00:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d37c025300a560c5aba67a46d8029e47 SHA-1: 53235bd34dfbc66533dcb599a58c36c798b3bebb SHA-256: c927a0853d822a3d5d67e49dc4322001899850ef2c7e2fb919c65e48c1966a72
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains references to product names and technical terms, reinforcing the lure aspect.

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
  • 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.
  • 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://wastran.ru/pbw?utm_term=troy+bilt+horse+blades+won%2527t+engage PDF link annotation
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/fukulepiximetasa.pdfIn PDF document text
    • https://lotaximadezepa.weebly.com/uploads/1/3/1/3/131379514/norozowanan-xewuvuno-baramek-dikokubomenu.pdfIn PDF document text
    • https://sapixokevabose.weebly.com/uploads/1/3/4/4/134498139/vaputajawap.pdfIn PDF document text
    • https://nabapobu.weebly.com/uploads/1/3/7/5/137501246/6700694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412161/normal_60b893b04a2fb.pdfIn PDF document text
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/687f40a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476930/normal_6061c9e1cbadc.pdfIn PDF document text
    • https://kilazazemuvazu.weebly.com/uploads/1/3/1/4/131452741/dujilowoje_vilaxabine.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501774/normal_6007d6f70198b.pdfIn PDF document text
    • https://wotipivas.weebly.com/uploads/1/3/1/4/131482993/2737741.pdfIn PDF document text
    • https://xafasujogi.weebly.com/uploads/1/3/4/3/134374351/zalabowowesuvesax.pdfIn PDF document text
    • https://kilosite.weebly.com/uploads/1/3/0/7/130739696/89de8f36e08b.pdfIn PDF document text
    • https://gavivexov.weebly.com/uploads/1/3/4/6/134667590/9771831.pdfIn PDF document text
    • https://fofosefekilom.weebly.com/uploads/1/3/0/8/130813764/dinikulexasu_gofosedut_paxikafowinawos.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/wavekas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366359/normal_6010b70a357e2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/295942be-484d-4659-84aa-526172b9bd34/fejotabazibewizuloxabisoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79d9da8b-c303-403f-aa1d-57c0fe053519/kegivezikabalaliveli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2d10d5-6f51-47ae-b125-c279b95e6b43/81058813578.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_off0000eb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB58 5404 bytes
SHA-256: 14c4a9b1d109c605068cc38771ae1ba01042e336c781bf962bac887264ea2157
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 15624 bytes
SHA-256: 4d114297481fbcd60d1255ac2ee3079599f441bfdc8c41782176ea5a821a9be5

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