Malicious PDF — malware analysis report

Static analysis result for SHA-256 630a3a0abfc18e97…

MALICIOUS

PDF

81.7 KB Created: 2021-03-01 23:29:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8a76142720ad683edd6663d02de23a56 SHA-1: dacb8109b53b086337c6b3e8c253d2a8b9dac972 SHA-256: 630a3a0abfc18e97b077ddc3ede301a8ca16e5613ad3df9aab4733e7f9900a7f
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable domains, indicative of a link farm. One high-priority heuristic flags an invisible link to a suspicious domain, suggesting a lure for users to click through to potentially malicious content. The PDF's structure and the presence of numerous external links suggest it's part of a campaign to manipulate search engine results or distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://bologen.ru/strik?utm_term=is+a+roomba+worth+it+for+pet+hair PDF link annotation
    • https://febumade.weebly.com/uploads/1/3/4/7/134757335/6633355.pdfIn PDF document text
    • http://supportcopyright.net/87263921538l3wld.pdfIn PDF document text
    • https://sirewuri.weebly.com/uploads/1/3/5/2/135298631/7e8a4cc4.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/7rheGhi/star_wars_lego_spaceship_toys.pdfIn PDF document text
    • https://bipipabogudas.weebly.com/uploads/1/3/1/1/131164499/b2304e6696.pdfIn PDF document text
    • https://fajalosi.weebly.com/uploads/1/3/4/9/134901252/4a909cfd.pdfIn PDF document text
    • http://savadaqwe.space/gerbera_cultivation_guidegs0h7.pdfIn PDF document text
    • http://nexofozupugasi.mywebcommunity.org/free_play_scripts_for_elementary_students.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/BQdgfJi/windows_8._1_usb_boot_software.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/wozujuxadon-fosol.pdfIn PDF document text
    • https://julavatevimire.weebly.com/uploads/1/3/4/6/134669339/7507397.pdfIn PDF document text
    • http://roman-holidays.shop/jsw_roofing_sheet_costhn47h.pdfIn PDF document text
    • http://com-login8.xyz/vobiwofugasizagoxilcyug.pdfIn PDF document text
    • https://sarerudaguf.weebly.com/uploads/1/3/4/3/134373173/dinozikunolekuli.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/jjdNjUh/smash_burgers_on_electric_griddle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokubamobivavum.onlinewebshop.net/zudunezusanegovi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10287 5276 bytes
SHA-256: bec50103b4ad68b59d1b9f7ee24da00dd2450ccb3d0b743935239a6d53139b66
font_01_sfnt_off00011461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11461 10932 bytes
SHA-256: 391ea6d4bac024cfc8c352f3084b9e61903bb255bc3f0e63d15e37c77bd28f60

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