Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e83f94639579b0…

MALICIOUS

PDF

70.8 KB Created: 2020-11-22 23:55:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a079c9b240eaa4c8b40f33bebc18eb36 SHA-1: ea5ba1f9bca75d2d33ee7e5c0cec1cf583a015fb SHA-256: 92e83f94639579b0917895e9db3aec2d2bb8ce4878bf1e36e4040fe75beb3d9a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable domains and one specifically identified as a link farm. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document's primary purpose is to redirect users to external, potentially malicious, sites. No scripts were extracted, but the presence of external URIs and the link farm nature strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://trafffi.ru/123?utm_term=my+family+story+brownie+badge PDF link annotation
    • https://daxuferawul.weebly.com/uploads/1/3/4/5/134592581/3987048.pdfIn PDF document text
    • https://nafeziwubiwodi.weebly.com/uploads/1/3/1/3/131379183/jizenolizusisuz.pdfIn PDF document text
    • https://bawidonawasaz.weebly.com/uploads/1/3/4/3/134354070/vuroketenuzomosus.pdfIn PDF document text
    • https://xezojasupaxu.weebly.com/uploads/1/3/4/3/134352535/8871465.pdfIn PDF document text
    • https://fupefasupemeze.weebly.com/uploads/1/3/4/3/134315788/zirupatoguje.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/bezudabani-jasuxavowo.pdfIn PDF document text
    • https://tovepeluzon.weebly.com/uploads/1/3/4/3/134385389/1852858.pdfIn PDF document text
    • https://webezajafe.weebly.com/uploads/1/3/4/7/134774073/rukevibovobexi_labizumuwipu_pamojax.pdfIn PDF document text
    • https://larogarokod.weebly.com/uploads/1/3/4/0/134018293/6165161.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5af55c70-2e78-40e9-9664-27a22b584953/57901596292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c38c74-3e9a-4b96-9156-a0f78b5a5190/bokodipade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b6051bc-1b3e-4fda-a0b0-fcb6a0ec8cfd/lg_sj4_review.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/80585222899.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3794fe4d-deea-4f14-8ff4-3d6e8172f826/dibuzamijopoxalosadadi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/554309d3-6713-43b5-968c-08b13956ed39/fortnite_item_shop_live.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA3 5352 bytes
SHA-256: 122b54eb70fec1497e426fb885da9293c3c93c29737ccf4c9fba48c6392e6d09
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 9828 bytes
SHA-256: b027b24458532a6c8944d4d64776cf1d782b7448210201228858a222be52b9ee
font_02_sfnt_off0001007c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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