Malicious PDF — malware analysis report

Static analysis result for SHA-256 db21fc5393200f17…

MALICIOUS

PDF

76.6 KB Created: 2021-03-03 18:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9800dcc78463b464bff838202c5f9cc1 SHA-1: fc8b46b647584e07bbdb4640a280c1190120a9f4 SHA-256: db21fc5393200f17c4dba07bf53cf603968053d332f9c28babcbc9d8895c5f0e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO spam. While no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/award?keyword=crochet+patterns+for+beanie+hats PDF link annotation
    • https://cdn.sqhk.co/muzedikerum/ejh3hbZ/27105011791.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383681/normal_5fd0f4eb685a0.pdfIn PDF document text
    • http://dipenoguzel.sportsontheweb.net/8352836911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fd65bec54231.pdfIn PDF document text
    • http://rigudozefogo.mypressonline.com/oster_oven_toaster_price.pdfIn PDF document text
    • https://vizegibog.weebly.com/uploads/1/3/4/4/134458583/velawizukejop-bojatotatu-nuxalejewoviror-fapuf.pdfIn PDF document text
    • https://cdn.sqhk.co/zebasama/7UgiK0s/shoot_em_up_full_movie_watch_online.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/0gchjcc/kasupafigitevidolojafobaf.pdfIn PDF document text
    • https://cdn.sqhk.co/fekolisuzub/iaOlYBf/nanem.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/23554133691.pdfIn PDF document text
    • https://cdn.sqhk.co/tugirujozi/mqj77gd/adidas_clearance_outlet_near_me.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
    • https://s3.amazonaws.com/tolivajupeku/mad_sad_glad_template.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/how_do_i_find_aa_meetings_in_my_area.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_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 5024 bytes
SHA-256: 76af56b67f79b47b14de5403c920a54b52e89647267c1a1dbabf770ec5460d3e
font_01_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 10592 bytes
SHA-256: b05e99b63e044e1f56f975bd62842ce48ac425c024039bfe75f1b3b0bab76d8e
font_02_sfnt_off00011733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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