Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd01cfdf5e2e396…

MALICIOUS

PDF

73.1 KB Created: 2021-03-12 04:26:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: eaaf26e68cd5492bb1a677e3172edfbf SHA-1: 9ad87255488304989a1a81aaff09811ea9f1d448 SHA-256: bcd01cfdf5e2e396bc4bca496a18f473edf1881c453a27922bd18ae6e7894f7b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=personal+care+assistant+job+description+pdf PDF link annotation
    • http://dogalijun.scienceontheweb.net/niluwebitowaze.pdfIn PDF document text
    • http://dapajurop.mygamesonline.org/learn_english_grammar_step_by_step_in_hindi.pdfIn PDF document text
    • http://miromawetibikew.mywebcommunity.org/how_to_use_soundlogic_xt_speaker.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/1396965897.pdfIn PDF document text
    • http://fepotarugagi.22web.org/chainsmokers_sick_boy_lyrics.pdfIn PDF document text
    • http://sutovuresas.mygamesonline.org/vitagirupilelujopufagi.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/pemovuludupinipuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuvefugokudob.epizy.com/petri_dish_grid_template_printable.pdfIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/64023742172.pdfIn PDF document text
    • http://daguvagobilat.rf.gd/bridge_rectifier_circuit.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/graphing_lines_in_slope_intercept_form_practice.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/gipajigivabow.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/wufavuvopi.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/calculations_in_chemistry.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/lcm_gcf_worksheet_grade_4.pdfIn PDF document text
    • http://totofexux.epizy.com/5914354213.pdfIn PDF document text
    • http://rajakoxefulume.epizy.com/aero_space_reports_inc_oklahoma_city.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_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 5368 bytes
SHA-256: f9e616803100bbb9781f868069bf481c6a29e223032e81464a51b3b25744c206
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 10556 bytes
SHA-256: 57fb0e7b9366e84995da4a60fe375453bef9c236ce803a36473e6c014e7111e8