Malicious PDF — malware analysis report

Static analysis result for SHA-256 a188776ac2db06bd…

MALICIOUS

PDF

75.9 KB Created: 2021-02-24 19:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 29c389e8b639124ba482fd451d11a19a SHA-1: 8cf54710ef729ea3cffe841249cad2a9226a139b SHA-256: a188776ac2db06bdbeb7d07af4c435029fef7591cc885e01b769adb77e62e8cc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to awards and reconstruction, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://leonvi.ru/award?keyword=post+civil+war+reconstruction+period PDF link annotation
    • http://jadogaxarabu.mygamesonline.org/36180778640.pdfIn PDF document text
    • https://lodonukatozusa.weebly.com/uploads/1/3/1/0/131070116/xesub.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/holt_geometry_chapter_7_test_form_a_answer_key.pdfIn PDF document text
    • https://kujadivenudeku.weebly.com/uploads/1/3/5/3/135324903/forivuxo-visapoxib-dudalufe.pdfIn PDF document text
    • http://golixudib.mypressonline.com/2011_maserati_granturismo_convertible_price.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/nuredumaxusenuj.pdfIn PDF document text
    • http://timinome.getenjoyment.net/siruxolexaluvufem.pdfIn PDF document text
    • https://ritosameb.weebly.com/uploads/1/3/4/2/134266106/5103637.pdfIn PDF document text
    • https://wozomeki.weebly.com/uploads/1/3/0/7/130776066/4d29b273394.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/where_is_the_defrost_timer_located_on_a_hotpoint_refrigerator.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/netters_anatomy_flash_cards_online.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/glacier_bay_water_cooler_dripping.pdfIn PDF document text
    • http://penageli.getenjoyment.net/danby_premiere_dehumidifier_ddr60a3gp_not_working.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/origami_software_free_download.pdfIn PDF document text
    • https://rokipidofavum.weebly.com/uploads/1/3/4/0/134042790/3189217.pdfIn PDF document text
    • https://lirodute.weebly.com/uploads/1/3/1/8/131871659/jiguf_rigubepu.pdfIn PDF document text
    • http://kenugizi.getenjoyment.net/singapore_math_syllabus_kindergarten.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/273081.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/97490499446.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/the_lady_with_the_dog_theme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/fogazerewolebitiluginexi.pdfIn PDF document text
    • http://kosezofejesuxef.atwebpages.com/50604094837.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_off0000ed4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 5220 bytes
SHA-256: ff2027eb0eaca6d332702999330ca79d09a4480d33386ab6484108c874c64609
font_01_sfnt_off0000ff33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF33 10208 bytes
SHA-256: 8194f082d12939df9c7bc2b59d1058b97373966f8c6aabbf77b0cb9544d91baf

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