Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e398924af35660…

MALICIOUS

PDF

48.0 KB Created: 2020-10-07 00:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 283081635277e938cd3427bae977be33 SHA-1: 75ce6984376e6a61b1bcf18a80550b4da994f643 SHA-256: c6e398924af356606be185673aa7852584b89e432e9bd2504ba57c9eb35777f7
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://cctraff.ru/strik?keyword=metabolism+food+label+lunch+lab+answer+key In PDF document text
    • http://files.realmarketingclub.net/uploads/1/3/1/4/131407183/sipoposatikur_sobuso.pdfIn PDF document text
    • http://files.gffmi.org/uploads/1/3/0/8/130814195/3ea607be3d4994c.pdfIn PDF document text
    • http://files.leisacorbettart.com/uploads/1/3/1/4/131409017/kigasipis_wulefakof.pdfIn PDF document text
    • http://revubenaz.firstchurchunionville.org/uploads/1/3/1/0/131070355/1595627.pdfIn PDF document text
    • http://jusib.mtmsmusic.com/uploads/1/3/1/3/131398452/witorokamu.pdfIn PDF document text
    • http://reroli.wetherillparkchurch.org/uploads/1/3/1/8/131871390/xuxosoku.pdfIn PDF document text
    • http://files.roccitytumblers.com/uploads/1/3/2/6/132696030/8972275.pdfIn PDF document text
    • http://vumed.avivahzornberg.com/uploads/1/3/1/4/131411199/wozik-teleximevusef-xibapexasisevol.pdfIn PDF document text
    • http://files.ycoayukon.com/uploads/1/3/0/7/130775732/fazasigiwiluju.pdfIn PDF document text
    • http://files.dottheicrossthetea.com/uploads/1/3/0/8/130814132/611843.pdfIn PDF document text
    • http://files.intentionalenrichment.com/uploads/1/3/1/6/131637178/ledenavel.pdfIn PDF document text
    • http://gefavo.wingsdance.com/uploads/1/3/1/3/131382982/duvamuwotogune.pdfIn PDF document text
    • http://files.annact.com/uploads/1/3/0/7/130740053/verekisulupapabis.pdfIn PDF document text
    • https://site-1038971.mozfiles.com/files/1038971/63289275951.pdfIn PDF document text
    • https://site-1037010.mozfiles.com/files/1037010/97052657786.pdfIn PDF document text
    • https://site-1036764.mozfiles.com/files/1036764/65224103290.pdfIn PDF document text
    • https://site-1039438.mozfiles.com/files/1039438/53517704617.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_off00007b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B77 5664 bytes
SHA-256: 1b9aeab0b95a73e5bcc52d368c81d6363117201ab7d81a868622d2a36de6bf70
font_01_sfnt_off00008eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB0 10592 bytes
SHA-256: fa186b7f90a29d0a9da3eab5c4f16e0547feb5d5f4f0e4490442ff73ccbaf2c1