Malicious PDF — malware analysis report

Static analysis result for SHA-256 b37b6f3f8587d1d1…

MALICIOUS

PDF

72.1 KB Created: 2021-02-18 10:40:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ac58d5aa3240a39082c1b1e4a51948d3 SHA-1: 5dde8ea5025a2615f24b3154b1ee82b677bfc7c2 SHA-256: b37b6f3f8587d1d132a44b46ed8da20fbe2f70bc1b9b96a2fac277676c227e2e
252 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many pointing to disposable hosting, and one critical link to a known malicious redirector. The document body, though heavily obfuscated, contains keywords related to 'Webasto diesel heater cost', suggesting a lure to attract users to click on these malicious links. The presence of numerous external links and a malicious redirector indicates a link farm designed for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=webasto+diesel+heater+cost In PDF document text
    • https://mabunamu.weebly.com/uploads/1/3/4/9/134902385/1022762.pdfIn PDF document text
    • https://buxomajuse.weebly.com/uploads/1/3/4/5/134588570/aabf14d87.pdfIn PDF document text
    • http://vienvozvrat.site/barowewafexefonew49m9.pdfIn PDF document text
    • https://wiguvizokon.weebly.com/uploads/1/3/0/7/130776253/pakud-kerepuvemedan-lapivewurojip-tipiwe.pdfIn PDF document text
    • http://totalcreditreport.info/confidentiality_agreement_template_freeygrhv.pdfIn PDF document text
    • https://puruvafapazono.weebly.com/uploads/1/3/0/8/130815059/d22439d24fd60b6.pdfIn PDF document text
    • https://pufinixebajev.weebly.com/uploads/1/3/0/8/130873949/c6e71222f.pdfIn PDF document text
    • https://zedimubaxujejit.weebly.com/uploads/1/3/4/7/134715534/bapuwijijatezigo.pdfIn PDF document text
    • https://wudizabilizone.weebly.com/uploads/1/3/4/7/134745746/povatodixipolof.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/9982696.pdfIn PDF document text
    • https://jofudetazowus.weebly.com/uploads/1/3/1/6/131606688/f164a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_5fd6fb5b24a40.pdfIn PDF document text
    • https://poxolegap.weebly.com/uploads/1/3/1/0/131069824/kifepagutiguj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458428/normal_602c04b1efebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_6025be782a7d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_6012e1f69269e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367635/normal_602b7ba2737ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rerinago/team_organizational_structure_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/90327735858.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_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 5180 bytes
SHA-256: 8e619dbc2653af4812a0a1d0085c27cefa7cc1c745fb6bbf0bc0ddf46ce84689
font_01_sfnt_off0000ebda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDA 11056 bytes
SHA-256: 9268bf2df8c62bf4b30df55bfe51151d194bd5fdc64880b77089637baac771bf

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