Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ba399c1cc0235cb…

MALICIOUS

PDF

88.4 KB Created: 2021-01-09 22:56:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 106602771fe2b1bd06428a090b7c4a79 SHA-1: ce58ef51dcf7ef861f03a68a9a26dae91988de7b SHA-256: 2ba399c1cc0235cb7c9fc7144bd6be2b79e444ab0f08f80e9b47df887f5e43dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many hosted on disposable domains or subdomains, indicative of a link farm or SEO manipulation scheme. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this finding. The document body is heavily obfuscated and contains metadata related to its generation, but no clear instructions or lures are discernible.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://trafftec.ru/aws?utm_term=coliform+urinary+tract+infection+treatment PDF link annotation
    • https://cdn.sqhk.co/fokolamezo/gjgitRP/water_wyvern_ark_valguero.pdfIn PDF document text
    • https://remitibomuko.weebly.com/uploads/1/3/4/8/134853657/wijipete.pdfIn PDF document text
    • https://site-1176489.mozfiles.com/files/1176489/kikudugip.pdfIn PDF document text
    • https://site-1168537.mozfiles.com/files/1168537/halloween_paint_by_number_art_color_book_apk.pdfIn PDF document text
    • https://site-1178444.mozfiles.com/files/1178444/jelly_fruit_slices_candy.pdfIn PDF document text
    • https://tariroviwobin.weebly.com/uploads/1/3/4/7/134715354/xagoregefuwelak.pdfIn PDF document text
    • https://xekixudag.weebly.com/uploads/1/3/4/3/134336078/sizibe-kasoz-dorixetigeb-gajapo.pdfIn PDF document text
    • https://site-1178383.mozfiles.com/files/1178383/wiridorudo.pdfIn PDF document text
    • https://site-1167926.mozfiles.com/files/1167926/android_tv_remote_service.pdfIn PDF document text
    • https://woliremokeg.weebly.com/uploads/1/3/4/3/134340334/tomajezexutabizipo.pdfIn PDF document text
    • https://risimomumet.weebly.com/uploads/1/3/0/8/130814588/9f818.pdfIn PDF document text
    • https://mowejeli.weebly.com/uploads/1/3/4/6/134672800/ecbb6aa4.pdfIn PDF document text
    • https://cdn.sqhk.co/jagapifa/hejjehh/cleaning_checklist_printable_template.pdfIn PDF document text
    • https://site-1168486.mozfiles.com/files/1168486/sudefobokawegajajimopa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/lonely_planet_russia_free_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 3016 bytes
SHA-256: 970d176b516d8c98ca8c15a1d324715b840c7734b129ddc95cf049a786467851
font_01_sfnt_off00011d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9C 4856 bytes
SHA-256: bccdad854502bac691d86a407eba28c98171473a3444e712b96aef0bdf6c99e5
font_02_sfnt_off00012e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 11048 bytes
SHA-256: 52a6def35c41930c54def15c9510ab9b607d125d35de72021992d4bf329ab2a9

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