Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c81639671a01089…

MALICIOUS

PDF

76.3 KB Created: 2021-03-13 15:06:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e95b5a12c85ace9c2cc3a4aacd7b4ae9 SHA-1: 5f506e24745fae95e88c470639a2a45b12eb696a SHA-256: 1c81639671a01089c5d9f2262224a09249d7513462b25d6dcb154a2fba536a7b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/wix?keyword=hra+new+britain PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404755/normal_5fee997b3b9ec.pdfIn PDF document text
    • http://porizaritofo.mypressonline.com/prova_de_caldeiraria.pdfIn PDF document text
    • https://linepapimufuto.weebly.com/uploads/1/3/1/6/131637640/4437149.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469643/normal_602245ee40042.pdfIn PDF document text
    • https://dopovubejaxow.weebly.com/uploads/1/3/4/0/134017692/zazek_larogofipa_vazidipulepup_boverazisaxak.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369324/normal_6007aff0ce95c.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/jekRnJl/tryhard_name_generator_fortnite.pdfIn PDF document text
    • http://antonioit.space/bloody_platinumz1bf9.pdfIn PDF document text
    • http://lazujifoxupa.getenjoyment.net/developmental_psychology_definition.pdfIn PDF document text
    • https://ponigeje.weebly.com/uploads/1/3/0/8/130874529/fodepolepitomosukex.pdfIn PDF document text
    • http://app-3null.com/ambledown_claim_form_2019q6ou8.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/bumaxuxuxokiromemij.pdfIn PDF document text
    • http://idealslimitaly.site/150514050273964z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481058/normal_6023925defeaf.pdfIn PDF document text
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/3177687.pdfIn PDF document text
    • http://hayatevesigar.online/square_root_property_worksheet_kutax5gs9.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/iaj2f9L/nawewel.pdfIn PDF document text
    • http://affilateapp.online/nostalgia_popcorn_machine_instruction_manualrqalj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_603539c080520.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/licejhF/12655515192.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jumepenitujox.atwebpages.com/38846786852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/809668a5-2b7e-4247-a0d5-727f91ebd6bd/xafobarufimojitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39567f0a-5bd8-4b5d-850f-c442562b515d/junie_b_jones_reading_level_age.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_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 4664 bytes
SHA-256: ca3b2c0ac698b10654c732e0fcf103d2ca2d3d2541cfb632de1abc1249040cae
font_01_sfnt_off0000fc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC90 11844 bytes
SHA-256: edafd8853120632a4d7459ac59516e6498eb8eb467482a87026cf63b5a989329