Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3c56181e2e8a44…

MALICIOUS

PDF

70.3 KB Created: 2021-02-26 16:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2d3b5f85e09a43a9b928abfc07336092 SHA-1: 4eaa310b5341dc91dd4575bcc8a1f8f65064af31 SHA-256: 3a3c56181e2e8a44f6fe056bbc7d7703ba91ef24a43c879783829636cc7cc435
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to appliance repair, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=why+is+my+maytag+washer+not+turning+on PDF link annotation
    • http://copyrightshelpscenters.com/zelda_breath_of_the_wild_guideruyq8.pdfIn PDF document text
    • http://lovepositions.info/38873330318ii70x.pdfIn PDF document text
    • http://lerevujoda.iblogger.org/hello_brother_pk_song.pdfIn PDF document text
    • http://wuxolikuxa.22web.org/regopulele.pdfIn PDF document text
    • http://how2clever.com/survivalcraft_apk_2._2tosy5.pdfIn PDF document text
    • http://izzzaaa.space/free_download_of_the_holy_quran_with_english_translationox9si.pdfIn PDF document text
    • http://dajexori.mypressonline.com/vitamix_e310_explorian_series_blender_review.pdfIn PDF document text
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/a75c35a01.pdfIn PDF document text
    • https://zutepojajobemo.weebly.com/uploads/1/3/1/4/131454264/zorexisamivago.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/why_is_my_samsung_refrigerator_not_freezing.pdfIn PDF document text
    • https://jedidaril.weebly.com/uploads/1/3/4/6/134687024/titobefovuwoga-penemezevap.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/what_does_every_reason_to_believe_mean.pdfIn PDF document text
    • http://vitofemegawe.getenjoyment.net/60872281704.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/titugome/assistive_touch_apk_onhax.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/ginil.pdfIn PDF document text
    • http://fomobiwudaz.rf.gd/55547201275.pdfIn PDF document text
    • http://rulamiji.onlinewebshop.net/biswaye_replacement_craftsman_19.2-volt_c3_battery_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/fsx_key_command_for_reverse_thrust.pdfIn PDF document text
    • http://ragigixo.epizy.com/flight_simulator_no_free_online.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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 5276 bytes
SHA-256: c4fae4a9136d8c57f8e70e7a8eba82ceed9043eadfabfeb4cf6586718022e1a9
font_01_sfnt_off0000e92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92D 10316 bytes
SHA-256: 019774898db47bb06be23f35f51aa765d13820566ce130596ac375e640f28d71

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