Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3b70893ee70929…

MALICIOUS

PDF

85.1 KB Created: 2021-03-12 05:07:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 322c5682e2db5c1deb90e3804e073b79 SHA-1: 88f0ae914d1952301ddf88b70013722566f4f471 SHA-256: 1b3b70893ee70929414140e251b04039025c3f6493dcd2717c14c31867044d0b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with a significant number pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'worksheet answers' and is generated by wkhtmltopdf, indicating it's likely a lure to direct users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • 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://midufefew.ru/wix?keyword=understanding+the+atomic+worksheet+answers PDF link annotation
    • http://buzifun.22web.org/dafuvabutonugexofupo.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/4Oiihcx/ball_smasher_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/fiseguvugele/gtjmgdD/24534817321.pdfIn PDF document text
    • https://cdn.sqhk.co/migukosodaza/Oihs4ij/36337350739.pdfIn PDF document text
    • https://cdn.sqhk.co/buzulexoxuve/bghgf0T/snow_storm_superhero_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/mekaxosur/5C5PVhR/xuxusukepemutaz.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/vimal-lezopuxodixa-xaresabotijuw.pdfIn PDF document text
    • https://lodokevez.weebly.com/uploads/1/3/4/4/134476034/vafawo-wufubujo-neletowaxe-lazokuvizevovi.pdfIn PDF document text
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/5eccc2f.pdfIn PDF document text
    • https://cdn.sqhk.co/xororofomed/ejdVsgj/zepeto_game_apa.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/gc8kb2w/71367112414.pdfIn PDF document text
    • https://cdn.sqhk.co/novozefox/c4OQIww/65909835854.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://s3.amazonaws.com/loxopudizus/tatulerux.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/nusaduz.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/phet_interactive_simulations_balancing_chemical_equations_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/13687335489.pdfIn PDF document text
    • http://mokunir.rf.gd/kuxiwuvezulevudekebija.pdfIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/helldivers_steam_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/gezesidisiwanapadopozemiv.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/aeroponics_research_paper.pdfIn PDF document text
    • http://sivuvupaxiju.rf.gd/what_are_the_4_types_of_satellites.pdfIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/16142435833.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/at_home_crossfit_wods_no_equipment.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_off00010208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 5256 bytes
SHA-256: d6bf0cddb385b6db39a9046037f8783692bbf1509b586255db714f6c706b2e22
font_01_sfnt_off000113c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C5 10580 bytes
SHA-256: 6704d1acffff9b2c5db353af2325ccb1302f1fe81bfc0b37f6609a8f509c433f
font_02_sfnt_off000137f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F7 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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