Malicious PDF — malware analysis report

Static analysis result for SHA-256 f937f6d1e71ecf92…

MALICIOUS

PDF

74.4 KB Created: 2021-02-25 17:30:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1a6d0a48d6e94a22876c0598f61e45c7 SHA-1: 16725c3cd48aabce52aadbe252ad1d57d368c43f SHA-256: f937f6d1e71ecf92e46f464586c287c3203fd0e01461e56680add1efbc202a35
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were extracted, the presence of numerous links and the ClamAV detection suggest a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://yafferge.ru/123?utm_term=how+to+turn+on+wearfit+smart+bracelet In PDF document text
    • https://cdn.sqhk.co/kokijunuxagi/ja1ijgj/forgotten_hill_mementoes_walkthrough.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/quotation_template_doc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/igcGhd9/83986226804.pdfIn PDF document text
    • http://golixudib.mypressonline.com/metro_2033_redux_librarian_walkthrough.pdfIn PDF document text
    • https://cdn.sqhk.co/moturalogupe/fhchiic/dowotulonojobek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427504/normal_6014489714321.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_set_the_clock_on_a_pioneer_car_stereo_deh-p4000ub.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/68147191584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490523/normal_6011db47ce153.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/jasavopobonipomo.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/85063020250.pdfIn PDF document text
    • https://cdn.sqhk.co/kupawusel/8AqZ8xu/gupuxedoxogojalarudelemo.pdfIn PDF document text
    • https://cdn.sqhk.co/lazimafuxuxi/bXpXSrQ/58428877372.pdfIn PDF document text
    • https://cdn.sqhk.co/dipewoduge/gQQGgdA/ultimate_lion_simulator_mod_apk_rexdl.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/tc_nova_delay_factory_reset.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/what_is_the_moca_memory_test.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinijev.epizy.com/19048384183.pdfIn PDF document text
    • http://supuwevul.atwebpages.com/stronglifts_5x5_advanced_spreadsheet.pdfIn PDF document text
    • http://dadorisisewane.epizy.com/xanikoxifijub.pdfIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/mofobosebuzuzel.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_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 5220 bytes
SHA-256: 1cdc435707f138fecc44ebb40dd0a74a9aac833f8da14a8fb83db436f66ed59e
font_01_sfnt_off0000f50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50E 10920 bytes
SHA-256: aa95506b73dd6a6ad8207af32db233e3558b6de775e15463054bfc320962abd7

Open this report in the interactive analyzer, or submit your own file for analysis.