Malicious PDF — malware analysis report

Static analysis result for SHA-256 3810d0944a8cd876…

MALICIOUS

PDF

74.5 KB Created: 2021-03-09 18:21:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a7b464b06d585ba1f32cdb585efe89fe SHA-1: da717b99396a8d8331e39e5db106a3ae79e23e71 SHA-256: 3810d0944a8cd87633ae956c9bb52701961f2f25c6af22e5762f0a245be4c672
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm with numerous external URLs, including one pointing to zajinet.ru, suggesting it's used for phishing or distributing further malware. The document body, though heavily obfuscated, appears to be a lure related to 'Toro power clear carburetor adjustment'. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/aws?utm_term=toro+power+clear+carburetor+adjustment PDF link annotation
    • http://rollernefrit.xyz/tukagitufoxa46lt6.pdfIn PDF document text
    • http://sfhgfje5df.xyz/osrs_mimic_boss_guiderlksf.pdfIn PDF document text
    • http://ufenmac.com/52497167860vo9gl.pdfIn PDF document text
    • http://cancandance.org/rudodasvvlnb.pdfIn PDF document text
    • http://f1l3download.site/delaware_llc_annual_report_filing_feeckm9l.pdfIn PDF document text
    • http://springital.fun/big_buddy_heater_hose_quick_connecthm3rr.pdfIn PDF document text
    • http://alteramaks.world/tunipokazubozunipidubojidd6fo.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/743255e9-7477-4765-ab81-9b62feff5da9/gapedijebiwedik.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/how_to_get_my_ingenuity_swing_to_swing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e61310-d7f0-4a39-9a69-5eb189c406cc/modular_origami_sonobe_units.pdfIn PDF document text
    • https://443275ec-395d-4f86-84c9-2ed7a250e117.filesusr.com/ugd/7d471d_a8e61958ec22486ea6b8329e8a9efaa4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04acd939-ce41-4598-924e-feae24b31dbd/radumalafivazo.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/48182937587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5791394f-9bd7-4c34-8e25-96567fb2e108/47859828234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01184126-a4ce-4e97-b507-b4d0cba44c09/kebodidaxajonaf.pdfIn PDF document text
    • https://s3.amazonaws.com/jamuluvuvava/kelopewobuxabopozi.pdfIn PDF document text
    • https://s3.amazonaws.com/sosupejuxofedo/house_of_fraser_manchester_store_guide.pdfIn PDF document text
    • https://53860ffb-5975-4088-b838-5c82367c2827.filesusr.com/ugd/0d2908_b33901ae01704112bf1f71a4d5c6d587.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_4bd241e6a94746a1999bde889fc3aaef.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_a0e6147868aa4388a4c6a4ccfa6a772e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/murux.pdfIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_651cc91e642345b78f03cc12a1e7e7c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84c38e47-5a53-4da6-a5e1-f68849b08870/do_doctors_still_do_home_visits_uk.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_off0000d87c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87C 5308 bytes
SHA-256: c96c861d90f9225e33ff85b53414efba734b9a2282c103095611e8495ddc7825
font_01_sfnt_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 10328 bytes
SHA-256: f655959f9bb3662ec4f5422d7e15300c7af429c1259258fb32d634a162fbac97
font_02_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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