Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb58e4810e25e905…

MALICIOUS

PDF

83.1 KB Created: 2020-11-25 00:07:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 880ae178b6539f22f2b516e56e9753e4 SHA-1: d921b84881fb6f1decda4781525c97bea4af30ab SHA-256: eb58e4810e25e9059ac39119fee5529bc1be61cda138a565bb348536708d8318
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 7

  • 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.
  • 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
  • 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://trafffi.ru/123?utm_term=audi+service+manual+online PDF link annotation
    • https://vunixumo.weebly.com/uploads/1/3/1/4/131453253/e29f4423f6e95c8.pdfIn PDF document text
    • https://bevazemirif.weebly.com/uploads/1/3/4/8/134873662/4736379.pdfIn PDF document text
    • https://nakixeke.weebly.com/uploads/1/3/4/3/134354053/vozaxiripu_fafafomid_wobitoz_zufonajomog.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/zibipotupafigugidim.pdfIn PDF document text
    • https://lugemubijovige.weebly.com/uploads/1/3/4/8/134879604/balenogumubumunodote.pdfIn PDF document text
    • https://lifagixuwemup.weebly.com/uploads/1/3/0/9/130969738/7c71a773107faf.pdfIn PDF document text
    • https://zazowabuk.weebly.com/uploads/1/3/4/6/134641257/676064.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/zazelujeju/the_acquisition_of_information_from_quantum_measurements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f9c415e-f4fe-415c-857d-41faaefa2b5b/60695066119.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/teamspeak_android_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b12e6cc-dcd6-4894-8309-4562cc39ca26/kuwozedufiwi.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_off00010951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 5136 bytes
SHA-256: f240ae16121e14b599ccb5fdc885cc27de93c3583a1ea874b415bc6ef60fbad4
font_01_sfnt_off00011ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 10928 bytes
SHA-256: d43896d43440d1153f2702a2a9719cecddcaa74babd4d41e51473953173d5c0f

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