Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfa683ee097c558…

MALICIOUS

PDF

71.2 KB Created: 2021-01-26 22:05:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 564a6d116b1f4cecb7bb8c514ee2ca90 SHA-1: 767c85424666caf7b4e4750dbb7d6fedf656b2cb SHA-256: 8bfa683ee097c558a332c40539ca8deb7f116e4baf2be1767ccb0b18e930eb5a
192 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links and a link farm on disposable hosting, with one URL specifically flagged as a known malicious redirector. The presence of a 'download button' heuristic further supports a lure-based attack. While no scripts were extracted, the overall pattern suggests the PDF is designed to trick users into visiting malicious URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=cricut+expression+1 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4413126/normal_5fc5ae80a5de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fd7d32d0b55a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450250/normal_5ffc88dbadd2b.pdfIn PDF document text
    • https://tusululobiwivet.weebly.com/uploads/1/3/1/1/131163859/jajumuvuba.pdfIn PDF document text
    • https://guzajemifuraruv.weebly.com/uploads/1/3/0/8/130874286/wudakiwe-luzexofenirafop.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/ggijbJV/skrill_rapid_transfer_fee.pdfIn PDF document text
    • https://vuzowukuz.weebly.com/uploads/1/3/0/8/130814197/sexofi_zojor.pdfIn PDF document text
    • https://vixikubinimagap.weebly.com/uploads/1/3/3/9/133997110/3712bb06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495246/normal_600a76f413cef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gudanomakorake.epizy.com/article_apa_format_reference.pdfIn PDF document text
    • http://bimegisekew.epizy.com/92546652222.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/fikamejafukak.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/lisipejakiwositudakodije.pdfIn PDF document text
    • http://zemufobure.rf.gd/platform_cafe_williamstown_vic.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/tonuxiwewazubam.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/32716798698.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_off0000da1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1F 4708 bytes
SHA-256: 403a65632017e227c532b2048ba6d9a5310072bbf8aa13ab2accfc6d067b03c9
font_01_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 10864 bytes
SHA-256: 6903e62901d569469efed6e30ab028164919cab830aa77890c1e0a528c4e7b85

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