Malicious PDF — malware analysis report

Static analysis result for SHA-256 087bcafeb30e0976…

MALICIOUS

PDF

68.2 KB Created: 2020-11-16 23:08:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: b88cb4fdd54e2efcd612767264688d11 SHA-1: d41343af7006113bfe889527ada59487dda0c981 SHA-256: 087bcafeb30e0976cd9457e78705e76057fb20daacb2db6c741d30fd2882be31
156 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 0.9998

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 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.
  • 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://traffset.ru/123?utm_term=boulder+county+assessor+property+search+co PDF link annotation
    • https://rubuxunixo.weebly.com/uploads/1/3/4/5/134518382/suzarek.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/xefafimofaxeparekuji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459176/normal_5fa1e17ab544e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_5fad530042faf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368953/normal_5f88691b5a4b9.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/tetenifeme/cable_tv_guide_marco_island_florida.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/showbox_apk_latest_version_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/real_ielts_listening_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dcea71ff-d9ef-4297-9e1a-340ce57dd35d/polizakolevegofabanu.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/kamau_brathwaite_the_arrivants.pdfIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/netobojegut.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/kapuseropufuxono.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/78097009613.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/victime_bourreau_ou_sauveur_comment_sortir_du_pige.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_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 5312 bytes
SHA-256: 6402f6c70bb4891904e3779ec69365f6b4478bad4fd114cc5ec45f8ea6cbab05
font_01_sfnt_off0000dfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 10720 bytes
SHA-256: 511db3a09bb12fa4c72813d67acf18bba576839c0c4bdb247d9bbc8da3755510

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