Malicious PDF — malware analysis report

Static analysis result for SHA-256 403d4a672899897d…

MALICIOUS

PDF

67.1 KB Created: 2021-04-08 16:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3915f06f656973a7659ac56c59ca631d SHA-1: 3c41b854e55c69cc9e8694fcf9ea0dc42f5748e7 SHA-256: 403d4a672899897d87bef49d705a34b0bd3451d75129d50c2e266e32f4558801
146 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing or malware distribution lure. The document body, though malformed, suggests an attempt to disguise malicious content as educational material. The presence of numerous external URIs, many hosted on disposable domains, indicates a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://soxebez.ru/strik?utm_term=commands+and+exclamations+worksheets+2nd+grade PDF link annotation
    • http://vesixadaw.22web.org/vuzawukegirokopikojabefa.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/how_to_do_istikhara_while_on_period.pdfIn PDF document text
    • https://sesumevikenaful.weebly.com/uploads/1/3/5/3/135346106/putopomipijajag.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/gst_rate_on_transport_of_goods_by_road.pdfIn PDF document text
    • https://kenomixu.weebly.com/uploads/1/3/0/9/130969587/5b62770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_6049d505ba4ff.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/berorawatet.pdfIn PDF document text
    • http://kalowodopole.mygamesonline.org/11496882290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_601e4f6760f21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408324/normal_5fc56e2475137.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuxebezedigelun.onlinewebshop.net/manuel_d_apiculture_en_zone_tropicale.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/tejujixazagetavasevukoxeg.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/danganronpa_3_trial_1_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/what_do_the_cards_symbols_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ff9c794-0cb4-4ac6-a33a-c97728d285f8/90849876629.pdfIn PDF document text
    • http://jugikan.epizy.com/84242877252.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/ralerukesofutojagem.pdfIn PDF document text
    • http://lejibunigazaxa.epizy.com/samsung_rf267_manual_defrost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6d62a1-77dd-4a6f-9d4f-cd2d980b0aea/dyson_dc23_animal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36957fdc-bf2c-4070-aa81-45e2dccfba94/ikea_malm_twin_bed_instructions_old.pdfIn PDF document text
    • http://ravizovagusemav.epizy.com/class_9th_biology_notes_kpk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75abdeae-149d-4caa-932c-86bc4531577d/51669292738.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_off0000c7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E3 5616 bytes
SHA-256: aa597b4b766ce71b3fde4e9b0c8df366f35b9aa69fd97eeb2b2a4ee0f2b52b63
font_01_sfnt_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 10592 bytes
SHA-256: 9a519d7c68c8ec84451abc96855f1bd7ca58bbaa1deb9956765fc4d220ec46ab