Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7d89f71b7cfe09a…

MALICIOUS

PDF

121.4 KB Created: 2021-03-06 11:59:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3cc5c6108d14bb82d25bfe9b2b80b2a4 SHA-1: 1518e161e21ad9e33ee6c5bd09f10de27c44a15b SHA-256: c7d89f71b7cfe09ab53b8781761b19ff46d4a8de5cd856e272550214551ad4a8
304 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a malicious redirector and link farm, aiming to direct users to harmful websites. The presence of numerous links, including one to a known malicious redirector, suggests an attempt to distribute malware or conduct phishing. The heuristic firings indicate it's designed to lure users into downloading further content, potentially through password-protected archives, and ClamAV detection confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://yafferge.ru/wix?keyword=honeywell+th8321u1006+manual+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4403818/normal_5fc5c67f3a6ff.pdfIn PDF document text
    • https://zerebutaravuna.weebly.com/uploads/1/3/5/9/135965874/196157.pdfIn PDF document text
    • https://gejizataki.weebly.com/uploads/1/3/3/9/133997606/2667899.pdfIn PDF document text
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/wugin.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/vinazagezavid-tagoneve-kazejuzosu-tezadufanun.pdfIn PDF document text
    • https://xutekesavugev.weebly.com/uploads/1/3/5/3/135316407/zizeletogasukixibupo.pdfIn PDF document text
    • https://nonokutofukidob.weebly.com/uploads/1/3/4/8/134872148/balesanasutifa_velowezaxezin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488572/normal_5fe80ed6f158a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_603dbf393f5c1.pdfIn PDF document text
    • https://kibasixeb.weebly.com/uploads/1/3/1/4/131438563/zavenewikaniwenuta.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/5a9a63b2-879a-4229-b8fb-e1825dd54cd5/vaxadapudamefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88361a45-c734-4430-8885-92dcda71b4dd/manage_projects_in_ms_teams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b0c2771-b722-4f5c-8c16-4de643249afa/70190167761.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_18f94f87478249edb5f3636ad13286ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c23b68-7391-4d70-85fa-a9ef4e9d955b/weguguwoka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fb09a4b-24fc-477e-917f-899ebcac101b/directv_rc66rx_remote_not_working_with_receiver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/261af7ef-38ac-4163-abcf-b0f60b3fe396/how_to_become_an_interior_decorator_in_canada.pdfIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_bfa8ee6643044511a83926ac57c19093.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86450cf9-c652-49b6-9eaa-7ece4cd335b1/jesus_be_the_center_lyrics.pdfIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_22ea9fa6d7bc4759a1767d77cc3d899e.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_off00019c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C63 6000 bytes
SHA-256: 52c05a325827a276c41a58f98cf239a44bbdd3d03faed7b44bb12cd8ab015556
font_01_sfnt_off0001b0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0CB 11184 bytes
SHA-256: 945a340d92b74b2445b041950dcf47988030c57ac9570feab9345037070e7292