Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdb339fc944fb05…

MALICIOUS

PDF

75.1 KB Created: 2021-05-16 19:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 46ccd2d06d1282189e56b3b440ed02d3 SHA-1: 101978048b1dc3af7e7ee9987ab52209c0858e9f SHA-256: 3bdb339fc944fb0541b69bcdda31d92ebbeb1d02466966be80a83ba529255560
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://golowaki.ru/strik?utm_term=tork+sunset+digital+timer+manual PDF link annotation
    • https://cdn.sqhk.co/dozirerom/fiagcFl/tojinujaretotamogol.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/america_s_history_textbook_henretta.pdfIn PDF document text
    • http://loneresel.mygamesonline.org/89131019151.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/uCxibhj/gegomixipofumu.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/hjjzEhd/87581987973.pdfIn PDF document text
    • https://cdn.sqhk.co/rutunidosaw/hhxhdig/introductory_agroforestry.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/eLjdCnb/mysterious_maze_cook_forest_pa.pdfIn PDF document text
    • https://cdn.sqhk.co/gusiloxi/gDVxjhy/85580334559.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/shejbgh/albilad_app_apk.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/cuantos_cm_tiene_un_metro_cuadrado.pdfIn PDF document text
    • https://cdn.sqhk.co/nipigagavadu/tJgdgiz/83062678505.pdfIn PDF document text
    • http://missunik.space/whatsapp_status_video_iphonerx2vl.pdfIn PDF document text
    • https://cdn.sqhk.co/busoleva/56ihhfT/91787202911.pdfIn PDF document text
    • https://cdn.sqhk.co/tobijoge/jihjgje/funny_animations_youtube.pdfIn PDF document text
    • http://winoraama.fun/gumubaxineleko98lz9.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/gifjcyI/bwise_grc_platform.pdfIn PDF document text
    • https://cdn.sqhk.co/kisasizaro/hihif6O/mojoguxusi.pdfIn PDF document text
    • http://podeves.xyz/pinitiwopafedatizudaaqvgp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaweratiz.atwebpages.com/contoh_abstrak_tesis.pdfIn PDF document text
    • https://34e2f0dc-0077-42bd-a047-efa2502e92af.filesusr.com/ugd/8a05ec_7f5de91ed67c444da07a9dae32abe580.pdf?index=trueIn PDF document text
    • https://7fad2989-91b8-457c-89bc-9a0e7aeef19f.filesusr.com/ugd/b03ff3_b3c244204699445ea3fd23f3b4c30619.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_8c682b48f06a463287fb717bc7486eb6.pdf?index=trueIn PDF document text
    • https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_3ec4ce15cda74440be32be6bad4b9cfe.pdf?index=trueIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_d562b9975f144579951f7b1d81a3ae79.pdf?index=trueIn 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_off0000e484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE484 5160 bytes
SHA-256: de50a9005eecfcc62e469b7a12a417695aaaec93733922a131c4673829356576
font_01_sfnt_off0000f600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF600 12032 bytes
SHA-256: 3a4ce836d96a97f490dae1232f2dfc3e76a37c9eeec6bef3191ad5e2fb3bcdbd