Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23aad565165f051…

MALICIOUS

PDF

81.6 KB Created: 2021-03-20 20:48:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0901dccfeac3dc9b5824f985156c2586 SHA-1: b8b102e1810428b46d0426ecc1750a57fa934bf0 SHA-256: a23aad565165f051689bdd56e443dc1a5e0d3e3736c18ff310f34eea10b6c4c5
146 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document may prompt users to call a number, a common tactic in tech-support scams or phishing. While no scripts were explicitly extracted, the PDF structure and URL patterns strongly suggest malicious intent, likely related to initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jumiwimov.ru/wix?keyword=limited+brands+access PDF link annotation
    • http://zhenskiizhurnal.ru/boxing_star_apk_mod_1._2._0t6npo.pdfIn PDF document text
    • http://sneakerspapa.store/chartered_financial_analyst_institute_in_mumbaij9m4t.pdfIn PDF document text
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/pufowewagixigo.pdfIn PDF document text
    • https://cdn.sqhk.co/legikowe/d0op9le/the_rider_iowa_city_press_citizen.pdfIn PDF document text
    • https://cdn.sqhk.co/kavatupopum/hjxhgcM/thief_city_heritage_plaques_locations.pdfIn PDF document text
    • https://lufuneliza.weebly.com/uploads/1/3/2/6/132682735/bixamozope.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/rjghcjf/namabuxigaxakugo.pdfIn PDF document text
    • https://cdn.sqhk.co/baxemazisod/bAyie4X/vekuzufagag.pdfIn PDF document text
    • http://mimivamefigupe.sportsontheweb.net/56066573227.pdfIn PDF document text
    • http://natbeach.space/adb_drivers_for_android_phone4fs4h.pdfIn PDF document text
    • http://pet-guru.shop/the_left_behind_series_watch_onlines2elm.pdfIn PDF document text
    • http://russianpatentexpert.com/gonakexunumasumotoxususinkerbl.pdfIn PDF document text
    • https://wabuxopimigom.weebly.com/uploads/1/3/4/0/134042903/lafivijuditamif_vadexorozu_genalezifafepor_lisemage.pdfIn PDF document text
    • http://vixabaj.scienceontheweb.net/anamorphic_illusions.pdfIn PDF document text
    • https://loniforuwo.weebly.com/uploads/1/3/4/9/134904684/kobejodexepapo_jigoxekof_garawar.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/7a082866-3ef9-4710-b403-4bd33a8d1bbc/32517536305.pdfIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_35013e63b56b429e8389a3d9922405b6.pdf?index=trueIn PDF document text
    • https://e60c805d-b9e1-47fc-b045-983511e9ac1f.filesusr.com/ugd/116bb2_8335d468c65f48249b94cef17b3e4733.pdf?index=trueIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_fd56879211aa498e9ba12a2d3b3b15a4.pdf?index=trueIn PDF document text
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_54803e137e244efbab3f943b05fed60b.pdf?index=trueIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_c5c5c1bed67241a7adc6ea88b8238e54.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b0064d-836f-4aae-91ba-41e302b7e592/dosevudupadog.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_off0000ff62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF62 5132 bytes
SHA-256: 5aae3c49fd6a9d904e73595b6ee8e57b9521fc5294965919b9f7e3c33ddf952b
font_01_sfnt_off000110bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BC 11852 bytes
SHA-256: b9e59ffb39bd681e19531ac7809a544362cbc9906f3364c8951a2d76869202a8