Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2d430642a9b10f9…

MALICIOUS

PDF

70.5 KB Created: 2021-04-04 02:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 36672d83462daba0072a57d524615132 SHA-1: 56e61034550d1f132fe4bdedeef516a610c252a5 SHA-256: b2d430642a9b10f901e013d172f14fcf507de4624e78aabcef44d0093a24885f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=mundo+fingerstyle+tabs+ukulele PDF link annotation
    • http://thecet.xyz/tufunekeremrydvj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374847/normal_5fcd7812bc975.pdfIn PDF document text
    • http://podeves.xyz/97726863741ki16s.pdfIn PDF document text
    • http://rabota-plus.club/wizard101_death_spell_guideegknq.pdfIn PDF document text
    • https://zegaxazidunuxe.weebly.com/uploads/1/3/4/7/134746987/gazupat.pdfIn PDF document text
    • https://sipavokipepino.weebly.com/uploads/1/3/4/3/134330850/1519d1284a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369183/normal_5fe03dfd9dfbf.pdfIn PDF document text
    • http://ru-payment.casa/always_on_edge_lighting_app_download5gc7q.pdfIn PDF document text
    • https://vinofuloro.weebly.com/uploads/1/3/4/8/134850824/nupovonuloxedabedu.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/8a9d5e6d-a56d-495a-82f0-c6f1dea887ff/what_is_the_fear_of_called.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a01f4438-bd7a-4ee3-ac53-13183cb04c49/kenmore_electric_range_element_not_working.pdfIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_1a0ba3b2d9604486849590d33f583a84.pdf?index=trueIn PDF document text
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_87b9bf39fde7426d8f300ea35b6151a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nasitevu/mowuliku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e5869fc-0d23-4f71-aa6a-6193618dbba1/tatezidajadefexoworo.pdfIn PDF document text
    • https://s3.amazonaws.com/juvosi/87457194876.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/singer_ingenuity_7436_price.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/tabla_periodica_grupos_y_periodos_exani_ii.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_off0000d637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD637 5388 bytes
SHA-256: d86702791d9386ea84d298e490bd26c28d9ef5bd482a8e940b0dc2d08dcdd59c
font_01_sfnt_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 10424 bytes
SHA-256: 7e8ec9e1de0696e3269650174f95478186505f8ae53ac76fefdd25f8c53fad70

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