Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef37735432399a8…

MALICIOUS

PDF

74.6 KB Created: 2021-06-11 20:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f158fc2326bab5ca562a749d1ff681f5 SHA-1: 1058690b7b22d54b814119c943ec05510929e798 SHA-256: 8ef37735432399a808d74fb6eeda160f9865d612f92a34c720d379a8ecf02fab
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to be a lure related to 'industrial psychology mcq questions and answers pdf', intended to trick users into visiting the malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/pbw?utm_term=industrial+psychology+mcq+questions+and+answers+pdf PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4393179/normal_60aff6865c11c.pdfIn PDF document text
    • https://fibetenozogu.weebly.com/uploads/1/3/0/8/130813768/wazatogusaruw-jupok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469633/normal_6052b2317af1f.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4425919/normal_60b2722653274.pdfIn PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/xizusuxuzowo_gipeza_luvix.pdfIn PDF document text
    • https://nubeboganiroj.weebly.com/uploads/1/3/1/3/131384383/fa468cec3d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374978/normal_604469656c8eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476595/normal_6002b4b15e895.pdfIn PDF document text
    • https://rizaxulizogi.weebly.com/uploads/1/3/4/7/134753796/1d6e8b8c700.pdfIn PDF document text
    • https://pevexozu.weebly.com/uploads/1/3/4/8/134857768/ef89906.pdfIn PDF document text
    • https://wiliwakura.weebly.com/uploads/1/3/4/5/134596421/9842014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416319/normal_603b0ab20fa17.pdfIn PDF document text
    • https://jasesokotu.weebly.com/uploads/1/3/4/4/134499989/7053800.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/60eaff60-1d78-4e65-9049-1bbb2456e392/which_countries_give_aid_to_pakistan.pdfIn PDF document text
    • http://faxofapuf.pbworks.com/w/file/fetch/144647136/rifesamagavosarujaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/536d76d8-202a-4cfd-a39a-98402fb421ee/kinoganojowemunere.pdfIn PDF document text
    • http://zigunef.pbworks.com/f/atk0100_driver_asus_windows_7_32_bit_download.pdfIn PDF document text
    • http://pajinap.pbworks.com/w/file/fetch/144495624/cant_sign_into_google_account_on_android_phone_something_went_wrong.pdfIn PDF document text
    • http://guwodav.pbworks.com/f/dusabijozajawavaril.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/895550ff-bd56-4338-b08f-5e7cc30a8766/washington_dc_metro_map_with_hotels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffdac1f9-37f3-4ab1-8a16-cfd22fc6816c/malig.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_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 5828 bytes
SHA-256: f3e63ac40ae9cba3c66a940c2b8bf07ec1ce678b40a34872d3273449af58199a
font_01_sfnt_off0000f976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF976 10436 bytes
SHA-256: 4c650876550a977cbc85e08206bd26a34dc19fea78905325f8acc13fce27eeda

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