Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f3bbb23af0c740…

MALICIOUS

PDF

157.4 KB Created: 2021-03-21 21:31:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4d2b4eee0f2bf3c5110d32bc8f9bd204 SHA-1: 264ff1e32d5cc7371cc097119a82a57bb9117bee SHA-256: 16f3bbb23af0c740ff07f972d32f51e60b5381330e99d8a74c762aa8c7b59e1d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('botokaw.ru') that appears to be part of a link farm. The presence of these URLs suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://botokaw.ru/wix?keyword=airbrush+cleaner+diy PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4488335/normal_60005f9cc34ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367268/normal_5ff481136621a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450636/normal_5fceb5c041da9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413564/normal_603f7aab34f16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469850/normal_6037d533e3cda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483338/normal_600ee7adec50c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_6003b54b26800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386852/normal_60568ac7e8272.pdfIn PDF document text
    • https://cdn.sqhk.co/jefutubup/hhLidgf/13381910986.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_5fe6f1db77313.pdfIn PDF document text
    • http://zilixijabukepul.iblogger.org/tudopag.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxolusufa/SgdJicv/13636473763.pdfIn PDF document text
    • http://gavepokuni.22web.org/vector_canape_demo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c948e902-2437-43f3-9f1e-7aaad30688a7.filesusr.com/ugd/464a75_9a5cf09d2f3945af845db1aa32cbde9f.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_02fc39bc8491454a99561312806f4444.pdf?index=trueIn PDF document text
    • http://nadowitumo.rf.gd/57955295120.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC73 109420 bytes
SHA-256: dd791a3002034a1d2772fbf3964337cb682a513197469dd4723a6a5bd69c5f86
font_01_sfnt_off00023134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23134 5256 bytes
SHA-256: 3b0165026c6ddfad9f3ef092336535b8b10ea5d1053b39f761ea512084b238fa
font_02_sfnt_off00024314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24314 10544 bytes
SHA-256: f92591089686e11031bc66a68a46e92172cd06a8f926feb8ff75e381366c5043

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