Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d65cd70b57be6c…

MALICIOUS

PDF

77.9 KB Created: 2021-04-02 03:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 25ed7c63548c6285dcb94f7c1efc3398 SHA-1: 7499c799871c177820128218f5010ff80b3dd83f SHA-256: a2d65cd70b57be6c64bf6df13442ad99a55258aea0eea472857940b942e35408
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://druttle.ru/aws?utm_term=what+time+the+nail+salon+open+near+me PDF link annotation
    • http://afterdealer.pro/the_joy_luck_club_book_characterswc2oe.pdfIn PDF document text
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/9380419.pdfIn PDF document text
    • https://kidenido.weebly.com/uploads/1/3/1/6/131636891/68e58a92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_5fd667d43c9b8.pdfIn PDF document text
    • http://samozanyat.info/52538440037v125r.pdfIn PDF document text
    • http://vittorguxx.site/rujipodevabejizuroqpr.pdfIn PDF document text
    • http://alisaborodaenko.design/instant_email_t-_mobile_loginee25p.pdfIn PDF document text
    • https://jirakeleda.weebly.com/uploads/1/3/5/9/135992973/1609429.pdfIn PDF document text
    • https://jiparebifipi.weebly.com/uploads/1/3/4/6/134638028/ad1b2.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/3882886.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490121/normal_605df8f7e0bcf.pdfIn PDF document text
    • http://hookup673.site/multiple_reflection_of_light_worksheet7zzoz.pdfIn PDF document text
    • http://bcipreactivaperu.com/41835340423y9l1z.pdfIn PDF document text
    • http://devlp.design/843675380263h775.pdfIn PDF document text
    • https://girusidopot.weebly.com/uploads/1/3/0/7/130738876/paxezidovaxidube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_605ef2e982477.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5fc8a1dadc0a3.pdfIn PDF document text
    • https://nolipugi.weebly.com/uploads/1/3/4/6/134652161/1627797.pdfIn PDF document text
    • http://axecheat9.xyz/novaxuvowuja4k1jo.pdfIn PDF document text
    • http://latencfsrt.space/python_3.4_tutorial_download_in_hindiga2lw.pdfIn PDF document text
    • https://nedalejurozawo.weebly.com/uploads/1/3/0/7/130776692/8986636.pdfIn PDF document text
    • http://kostlike.site/zufezivisavup4usqn.pdfIn PDF document text
    • http://teksalle.xyz/fanesinozuvuwovibee24id.pdfIn PDF document text
    • https://topigofifudonif.weebly.com/uploads/1/3/5/3/135304546/366fe.pdfIn PDF document text
    • https://wiromokuxuzub.weebly.com/uploads/1/3/5/2/135298753/8429200.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 5072 bytes
SHA-256: 8ccffd84409687f455bb3b50b045d8f60f0e13adc422d52139776f7190035bc4
font_01_sfnt_off0001038a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038A 11432 bytes
SHA-256: e9842ab504e146a5384cbf76eaaf147f26c954237ffda0e7022626f5d1bb43d0

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