Malicious PDF — malware analysis report

Static analysis result for SHA-256 77112bcc2b7f76e0…

MALICIOUS

PDF

80.0 KB Created: 2020-11-24 16:51:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: a0fe08082b69d1964656e9581213eeb7 SHA-1: 1d46b144c23ba3de50c1f05ffde9021c1cc3db86 SHA-256: 77112bcc2b7f76e079285dfa7cc3e6bc07a5bc6c9f0002761b0cca691c008199
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 0.9998

Heuristics 6

  • 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 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://traffnew.ru/strik?utm_term=curl+up+test+average PDF link annotation
    • https://tusovaxurekugu.weebly.com/uploads/1/3/4/9/134900319/1624687.pdfIn PDF document text
    • https://nenuxigibasus.weebly.com/uploads/1/3/4/6/134694542/ziwosavoxaso.pdfIn PDF document text
    • https://goxapumub.weebly.com/uploads/1/3/4/8/134884232/323746.pdfIn PDF document text
    • https://zisatusomet.weebly.com/uploads/1/3/4/8/134872515/432138dea2195.pdfIn PDF document text
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/rawizin-rexogefiwuxafat-jitadakigi-xozibutorem.pdfIn PDF document text
    • https://zomujowedava.weebly.com/uploads/1/3/4/6/134629266/9641da92190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408197/normal_5f9ea7c0ac523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fbaaadf2113f.pdfIn PDF document text
    • https://faluwizux.weebly.com/uploads/1/3/4/3/134372305/8735137.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/jonora/anthima_parata_amathanna_song_hiru_fm.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/31556163675.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5382d102-376d-45d2-9c59-91196d7157f2/82815894335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53031978-ad95-497f-9266-04aaf2950129/waxabedajotitubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32498e9f-e9c7-41de-af97-2ebf68238071/75784751234.pdfIn PDF document text
    • https://s3.amazonaws.com/naramuro/lolukitevetogarodug.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 4952 bytes
SHA-256: 9b8eea1e81355fdaf7dfa111730d8c7d7e17acdb03fc68e2bb4c0b8ee6224f14
font_01_sfnt_off0000f6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 10900 bytes
SHA-256: 55b2a577f16cf672d98eb1a15c0d89fd769e770e811936267d1294d763426a2a
font_02_sfnt_off00011c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 16544 bytes
SHA-256: 4354bd37e85197a997b2f6c8c8698034d2711068b41d1b66819094364c364bcc

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