Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f5173a7967f35c…

MALICIOUS

PDF

39.7 KB Created: 2020-10-07 05:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: baa850d6f3d50150c666fc57b220b94e SHA-1: e2b00e0e8f21f5d848a061ef907521128a1947ce SHA-256: 83f5173a7967f35c75fff397e3d4b564d478ee8c57e53f24f2f090076787f959
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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 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.
  • 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.
  • 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://gettraff.ru/strik?keyword=upper+intermediate+test+pdf+with+answers In PDF document text
    • https://site-1048453.mozfiles.com/files/1048453/62682101837.pdfIn PDF document text
    • https://site-1039496.mozfiles.com/files/1039496/72256956790.pdfIn PDF document text
    • https://site-1041498.mozfiles.com/files/1041498/37543826697.pdfIn PDF document text
    • https://site-1038601.mozfiles.com/files/1038601/69107153964.pdfIn PDF document text
    • https://site-1039669.mozfiles.com/files/1039669/56025106062.pdfIn PDF document text
    • http://files.carverarms.com/uploads/1/3/1/6/131607310/juxepav.pdfIn PDF document text
    • http://files.calebmurray.com/uploads/1/3/1/3/131380915/tegewabubera_fifexajex_mizukalata_jegenos.pdfIn PDF document text
    • http://files.jacquelinetopakian.com/uploads/1/3/0/7/130776841/nopujixizeja.pdfIn PDF document text
    • http://files.maenadproductions.com/uploads/1/3/1/0/131071063/juberotadej_riditixepuwigiz_godixaxoz_dumutijipi.pdfIn PDF document text
    • http://files.goldinglandrill.com/uploads/1/3/2/6/132681340/finojo-nesafanet-zuzur.pdfIn PDF document text
    • http://files.transformingbarriers.com/uploads/1/3/1/4/131413678/c161737c0.pdfIn PDF document text
    • http://files.missionbrain.org/uploads/1/3/0/7/130775321/430e401bf5f7.pdfIn PDF document text
    • http://files.claire-williamson.com/uploads/1/3/1/3/131380550/paxunalosaz.pdfIn PDF document text
    • https://site-1039283.mozfiles.com/files/1039283/69857048536.pdfIn PDF document text
    • https://site-1041672.mozfiles.com/files/1041672/gexozufoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00005bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF7 5332 bytes
SHA-256: 1a64e63b0084136464c9a0e10401234acdc54d5654438d03a36c218a2f249d69
font_01_sfnt_off00006e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E00 10548 bytes
SHA-256: cebb5f0ada4f7b6e468952d6f143dcd82dd057b7263596345a3ca809e704da08

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