Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84e1686a7b6b7d3…

MALICIOUS

PDF

68.6 KB Created: 2021-03-24 14:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ada57de1a14076151aa9136b82a7796b SHA-1: ac3eb74ba3b90bb0e8564c17ad9d3d56e1055f5f SHA-256: a84e1686a7b6b7d3bb7777ba7daaae6e4575637d05c2253174bbca97f326c6e7
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The embedded URL 'https://xezojetit.ru/strik?utm_term=information+technology+manager+salary+nyc' is likely part of this scheme, attempting to lure users with a seemingly relevant search term.

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://xezojetit.ru/strik?utm_term=information+technology+manager+salary+nyc
    • https://vujalonekodi.weebly.com/uploads/1/3/2/7/132712286/gosatan-pavoxeguve-wavitipez.pdf
    • https://ferafavobob.weebly.com/uploads/1/3/4/6/134671558/7819852.pdf
    • https://nojesinas.weebly.com/uploads/1/3/0/9/130969722/pixovofajusekeroxob.pdf
    • https://gebejisidimi.weebly.com/uploads/1/3/5/3/135302949/tenerujuk_wawev_potubap_bubowasi.pdf
    • https://bekefipupo.weebly.com/uploads/1/3/4/0/134096026/kemerubifi_farubopulede_xarabu_dujalupudefe.pdf
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/jewelukexupoxo_tivuwusim_vejupom_zetine.pdf
    • https://xorizelipuv.weebly.com/uploads/1/3/1/6/131637744/3431446.pdf
    • https://jujowaganul.weebly.com/uploads/1/3/0/8/130874338/mewidofonexobuj-pikuxoxi.pdf
    • https://cdn.sqhk.co/fujotojaxob/ejfjbiW/38464367886.pdf
    • https://rirenumu.weebly.com/uploads/1/3/4/8/134884077/mavuw-bububi-tulotuwejerano-vorira.pdf
    • https://cdn.sqhk.co/zumufapofow/jchfhbD/dawuvili.pdf
    • https://xorurilij.weebly.com/uploads/1/3/5/3/135325910/kikevij.pdf
    • https://lazimepirurela.weebly.com/uploads/1/3/5/3/135350713/vigaromipadiseseva.pdf
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/9699850.pdf
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/6d0065.pdf
    • https://cdn.sqhk.co/tarudifirew/KvGjg1J/dikulosigafega.pdf
    • https://cdn.sqhk.co/romekeka/Ktj0gfi/dukidenidikew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_69e3dca014b4491dac0fd2e1ab5afe7a.pdf?index=true
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_9b542ec77da642829809902e158085b6.pdf?index=true
    • https://54957a25-093b-4cbd-a4f0-8eb5fea931f0.filesusr.com/ugd/8ba634_c90663db6ca64be7a27fd151e5c31116.pdf?index=true
    • https://5634f520-c25d-421d-ab67-3d94505d13cb.filesusr.com/ugd/1b85ab_b3fbc1d7d799407caaf687f00d010824.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd5a.bin
1be5cbd414c8223615bb51dce4be746bacacd5b6ae6c3dfa87bcb11204c7fe71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5A 5336 bytes
font_01_sfnt_off0000df5f.bin
0df60c0a60865965768ca0f7529b544c60fdb2d53c138fbb72cd8e8c53ce9dbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 11044 bytes

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