Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0171671bac5824d…

MALICIOUS

PDF

77.0 KB Created: 2021-04-10 17:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 747973a04650fd96022056e129da488b SHA-1: aef2292f73c964d819b0d78cdc80cacc6e2ad4d1 SHA-256: b0171671bac5824d92cd2727f0a69d30724a961ca70aab26485cee1c43d243ae
126 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary suspicious URL pointing to 'bologen.ru', suggesting a link farm or redirection mechanism. The document body, though heavily obfuscated, appears to be a lure related to an 'Oster bread machine manual', aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=oster+bread+machine+model+5838+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417805/normal_603ab95048022.pdfIn PDF document text
    • https://cdn.sqhk.co/bijozugetav/iMHzQMG/58448790701.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/33291874983.pdfIn PDF document text
    • https://logekififej.weebly.com/uploads/1/3/4/5/134502341/nuxadajet.pdfIn PDF document text
    • http://neridofufuleteg.scienceontheweb.net/bagagexesilogename.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6012e0578b275.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381735/normal_5ff0d8b6ed5d3.pdfIn PDF document text
    • https://nuwusiran.weebly.com/uploads/1/3/5/3/135321198/pejukibimulim_zovedep_batuporulitile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486778/normal_6014847055f35.pdfIn PDF document text
    • http://kufomabid.mywebcommunity.org/brahmanda_puranam_in_telugu_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/8MgjrV6/minds_of_nations_mod_apk.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/f019a5.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/0FpG2ig/latest_bollywood_ringtones_2019_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/83012023786.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/23025805095.pdfIn PDF document text
    • http://tobidogajetu.onlinewebshop.net/the_haunting_of_hill_house_download_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c33a118-1a6a-457e-bec2-c41f9eeaa806/i_am_a_church_member_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a380392-4585-44d0-83ed-1936d175ca17/biwagirobofawobipeluluk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3441c03e-2afc-48c5-889b-39e6bec51620/gosevejuzadagesikasu.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/does_playonmac_work_on_catalina.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/90914738836.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_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 5828 bytes
SHA-256: f1820e676549dae9d4726be32e695f3cdd8e391e981428adbcf266c6b296a106
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 10276 bytes
SHA-256: e4a7ff8d08f809b1f1f899d13b6303b6d61deb591cdeacc8a62619e1f83bb816

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