Malicious PDF — malware analysis report

Static analysis result for SHA-256 63ffd60a6547b894…

MALICIOUS

PDF

90.4 KB Created: 2021-04-01 17:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 21f0fbc6983b49177f20b7a5c2cfcc17 SHA-1: 23abaca8435d091cf89c2939dc68588f4cceb4f1 SHA-256: 63ffd60a6547b894c157372d02235e46663dd5ed753bbff4a9653583781aaa00
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable hosting services and utilize UTM parameters, indicating a link farm designed to drive traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host a large number of links.

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://mezovuduw.ru/strik?utm_term=why+is+my+kenmore+washing+machine+not+draining PDF link annotation
    • https://cdn.sqhk.co/lerutefo/5tbid6I/zombieland_2_madison.pdfIn PDF document text
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/6068163.pdfIn PDF document text
    • http://1pokypki.website/xotobuxotafapatomk4kli.pdfIn PDF document text
    • https://cdn.sqhk.co/figegixo/GhaiiYS/nibuneturekudologerakib.pdfIn PDF document text
    • https://kebolegenadudus.weebly.com/uploads/1/3/1/4/131454121/fozoxeboxeganut_bezorux_kenafifu_binivanuw.pdfIn PDF document text
    • https://sijudunewofas.weebly.com/uploads/1/3/4/6/134696620/9745590.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/Tjhgddc/network_marketing_jobs_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/xasujuteguk/aIggoid/battlefield_1_for_pc_full_version.pdfIn PDF document text
    • https://xasigali.weebly.com/uploads/1/3/4/3/134363336/96939.pdfIn PDF document text
    • http://workbykoder.xyz/types_of_broaching_machinegnbk9.pdfIn PDF document text
    • http://niluwipewuxasa.medianewsonline.com/tamalizi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfe42bcd-18ca-4234-b5d8-cddb5a680c9a/who_is_gonna_play_prince_eric_in_the_little_mermaid.pdfIn PDF document text
    • https://8eccd3b7-fb20-4588-a5b5-4d8c58591879.filesusr.com/ugd/0e6328_c3ac2a0ecaff4f6dbff7af741b0ad93a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba41c033-6bd6-4942-bd42-8aaca4ded48e/jigexajiwiw.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_62cdeb7b27ae4dddbd5fad363342c40c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/433311bf-93e3-40c0-a3fb-30f541575abc/aquasource_faucet_valve_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6becff4e-6e5b-4203-9592-b141349d85d1/46299210981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87be83c0-d606-45a9-8a74-cba7e10364aa/63866242999.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/64405511189.pdfIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_e0b6d7699ad34fd2b7c67c7271a3f578.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 5592 bytes
SHA-256: dcc6abdbfde93be357af00ca3888db82337d9485d0b4d6f4164e32628060afe3
font_01_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 11208 bytes
SHA-256: a954bcb3734789de1cba43200de74f42c74a158cf8a1a39d3e55fdc19da3da59
font_02_sfnt_off00014656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14656 16148 bytes
SHA-256: 51babe3b44e703ca5a92278b053c112c5c116674d3b708c8e2cb3e4aa6bd9a04