Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c827a83a79f74cf…

MALICIOUS

PDF

81.4 KB Created: 2021-03-03 14:02:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a5b4a5ba7cf7c28b835c31de6b8e55a9 SHA-1: 7d6380908c298a3b2a618eaf9ea4a73ebb5c28f8 SHA-256: 4c827a83a79f74cf6b1effba059d4abfa896b22d242e8b822eb0dec80b2a3f6c
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and hosting services, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/award?keyword=how+much+money+is+chip+and+joanna+gaines+worth PDF link annotation
    • https://cdn.sqhk.co/makafabakuna/hfwhbMW/97096676814.pdfIn PDF document text
    • https://xulakuvoloja.weebly.com/uploads/1/3/0/8/130813987/72727b4d232.pdfIn PDF document text
    • https://xafasujogi.weebly.com/uploads/1/3/4/3/134374351/tenizogumam.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/doniwoxojuziv.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/kiss_the_rain_easy_piano_sheet_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459939/normal_603aef8265c34.pdfIn PDF document text
    • http://getplafond.xyz/22261754920qdoll.pdfIn PDF document text
    • https://vesifumami.weebly.com/uploads/1/3/5/2/135294942/5902298.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/jpheVgg/shoot_the_zombirds_apk_hack.pdfIn PDF document text
    • http://instasale.company/ipcc_report_2018_africa1o3u2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419410/normal_60222557408f9.pdfIn PDF document text
    • https://tubolapibakosi.weebly.com/uploads/1/3/4/8/134872187/f1b69f.pdfIn PDF document text
    • https://cdn.sqhk.co/gubujurit/Lkhaggx/lyft_driver_app_support_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/vgicLar/93744703469.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gimapetabotoza.rf.gd/rusinutufarizaput.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 5568 bytes
SHA-256: 1d69503ddc10b07ed1109edc6a173c2aca5843d412252c85765aa030cf706f01
font_01_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 10240 bytes
SHA-256: 3f3b7c3807b5dca88fb50036ae05f2366b5e9eb4ba6ac10e776096bf1fe08b0a
font_02_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 16096 bytes
SHA-256: 8c9c66c26bc936a258163e305d81f9b8351c2cb20ade0bcda03f12723e9249a5
font_03_sfnt_off0001299f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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