Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3897732c917ea87…

MALICIOUS

PDF

76.4 KB Created: 2021-05-10 13:08:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d252666ce8a133a04b706f9cda835275 SHA-1: 89cb56e754e99e6cf6c0410836d62421c87c492a SHA-256: d3897732c917ea873baaa73d05c68b20856756922082ae5786430cd3c65b17bd
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/strik?utm_term=wonder+book+pdf+free+online PDF link annotation
    • http://mokaxizekebade.scienceontheweb.net/36000177781.pdfIn PDF document text
    • https://xoxilorimisutoz.weebly.com/uploads/1/3/4/7/134705863/kiwupebuziz_xukekexuvo_sozirovog_xudupuna.pdfIn PDF document text
    • https://suguvojonejufo.weebly.com/uploads/1/3/4/5/134585364/barunibik.pdfIn PDF document text
    • https://karubidodofibe.weebly.com/uploads/1/3/4/3/134316277/2990010.pdfIn PDF document text
    • https://zevamomarage.weebly.com/uploads/1/3/4/6/134611313/3908573.pdfIn PDF document text
    • http://zesegalos.scienceontheweb.net/xodonugewuvobogulakiv.pdfIn PDF document text
    • https://robidolaw.weebly.com/uploads/1/3/0/7/130776002/defulunom.pdfIn PDF document text
    • http://fuvisetitisenon.mypressonline.com/taurus_g2c_trigger_review.pdfIn PDF document text
    • https://bakofusu.weebly.com/uploads/1/3/2/3/132303024/lisaxinedo.pdfIn PDF document text
    • https://gadolelexuzited.weebly.com/uploads/1/3/4/4/134486477/fisepe-raduxalusetimap-litozun-fisozufaziposi.pdfIn PDF document text
    • http://itdiscounts.info/american_gods_season_2_episode_6_recap4yhdi.pdfIn PDF document text
    • https://xutogimumunode.weebly.com/uploads/1/3/4/3/134375265/2777979.pdfIn PDF document text
    • http://premial.su/vozejiwowezixlif23.pdfIn PDF document text
    • https://taruzalo.weebly.com/uploads/1/3/5/3/135398133/gotim-zawakejuso-melazenekego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_83d173669fe249c9b5d8026872e641d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d372d78-8e1f-4692-96c8-726f3d19a7ec/mugiraw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a89978d-39b3-4c3d-8d8f-6469fa38b098/sketchup_pro_2018_license_key_and_authorization_number.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_ddd099d1e0004f4cba9b1865c627428d.pdf?index=trueIn PDF document text
    • https://b3df6b87-ca8d-4c26-b815-8c697753997b.filesusr.com/ugd/896a32_e31cb22dce3844dbb83c6f4c4980fda3.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_ee3cdbfa39584b95b0618a0774c51dac.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd48e7e9-ab93-4b87-a118-11b4beb60de4/xesunuge.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_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 4864 bytes
SHA-256: 320f437d7dcf24fe7975e4a121ebaea093013d20f372e89b1750ce1e8632ecc0
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 10964 bytes
SHA-256: ae7972ec0d865b15d761442b2bed47e17977af53f1fb3a514c1f07dda67bb04c