Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3da4f7c182b4a62…

MALICIOUS

PDF

85.6 KB Created: 2021-03-20 08:17:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5e66f72b1e5a1ffec1b6faed0eaeeb5 SHA-1: d85798ed588bccd0e0047de9b2dfd81d3a9e391a SHA-256: f3da4f7c182b4a628caa7969cc298aff040f6604be206a5a585515a26c322fe9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. The document body, though heavily obfuscated, appears to be a lure related to a 'Sears kenmore elite refrigerator owners manual', directing users to external sites for further interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=sears+kenmore+elite+refrigerator+owners+manual
    • http://garagodubowixa.iblogger.org/24105081091.pdf
    • https://cdn-cms.f-static.net/uploads/4390323/normal_60261bd488998.pdf
    • http://russianpatentexpert.com/define_realism_in_literature3rvyx.pdf
    • https://static.s123-cdn-static.com/uploads/4383921/normal_6001550227bcc.pdf
    • https://cdn-cms.f-static.net/uploads/4455883/normal_6038c7952f653.pdf
    • https://cdn-cms.f-static.net/uploads/4381762/normal_600db17440f41.pdf
    • http://rinobozawizuvew.iblogger.org/zogaxoterujufamasazom.pdf
    • http://mitimewigupito.mypressonline.com/apsc_syllabus_download.pdf
    • https://static.s123-cdn-static.com/uploads/4500895/normal_5ff295f32a811.pdf
    • http://tujidal.mypressonline.com/is_a_bond_order_of_1_2_stable.pdf
    • http://lodixewovufosa.iblogger.org/78834844711.pdf
    • http://neridofufuleteg.scienceontheweb.net/wonuwa.pdf
    • http://fineagencyy.com/wixamupejagibugem6kvg7.pdf
    • http://taxiditugivubed.iblogger.org/diplomov_prce_upol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c0ea4949-0e8b-4c45-b554-95d13afb3225/hp_1320n_driver_windows_10_64_bit.pdf
    • https://uploads.strikinglycdn.com/files/56e10ca3-3235-46f8-b246-cb866c335351/can_inspiron_1525_run_windows_10.pdf
    • https://s3.amazonaws.com/nalifij/mopowalolobukaregi.pdf
    • https://s3.amazonaws.com/fofeguj/73802390287.pdf
    • https://s3.amazonaws.com/gagagakigibapo/aldi_talk_aktivierung_app_android.pdf
    • http://sugebajofurite.rf.gd/form_amalgamasi_bpjs_ketenagakerjaan.pdf
    • https://uploads.strikinglycdn.com/files/809572cd-9b34-4cb2-ac66-76e4f9103564/what_time_does_the_stock_market_open_and_close_india.pdf
    • https://uploads.strikinglycdn.com/files/5927557d-1d86-41b9-9d11-8e7b1c4e7b80/mitonomafa.pdf
    • 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_off00010d82.bin
b4441df5fb5e638b8a23a1229ea5bf676fce5da1d264f1779afca5400cb762f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 5344 bytes
font_01_sfnt_off00011faf.bin
5c5f45011239fdcaf175f1f27087a1ccfa14fcb33eb3a93c783d9f5218921f85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAF 12268 bytes

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