Malicious PDF — malware analysis report

Static analysis result for SHA-256 661273d764462af7…

MALICIOUS

PDF

71.6 KB Created: 2020-11-09 22:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 57eae2dca10e54cbdfa585f6a18f7004 SHA-1: 215d134bb5a66041d00f09eb601d671df647d034 SHA-256: 661273d764462af71b034275ec0d85d62ebe1d9351e7f4ae137e93803930ccc8
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 0.9997

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://traffking.ru/aws?keyword=diccionario+biblico+pdf PDF link annotation
    • https://bafovulik.weebly.com/uploads/1/3/1/0/131070506/kapavogefogep_nilavugezabo_gakodidajapore.pdfIn PDF document text
    • https://padukasafif.weebly.com/uploads/1/3/4/4/134404544/2693775.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374374/normal_5f8920d66eeae.pdfIn PDF document text
    • https://zatazonikafude.weebly.com/uploads/1/3/4/3/134340422/7538042.pdfIn PDF document text
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/zumur.pdfIn PDF document text
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/0195a1d2167.pdfIn PDF document text
    • https://jupisururixed.weebly.com/uploads/1/3/4/3/134339091/duxafas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385647/normal_5f90b9968aba5.pdfIn PDF document text
    • https://dokarugosili.weebly.com/uploads/1/3/4/3/134362608/ziguraxanumatolakidi.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/samopakamefap/fimuw.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/90970956296.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/suzamirizeva.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_off0000c5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D9 5112 bytes
SHA-256: 80994d5802a06d74872be95182294c96110566b198b81eaf29e8313a6181772d
font_01_sfnt_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 11528 bytes
SHA-256: bc213c63454327a3001ae1ca0737e31dacf2a0ea4032f7cc5ac0de71c9906ab4
font_02_sfnt_off0000fd18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD18 16084 bytes
SHA-256: 462d13bd97d7d9b38b38dac4ddb889f891d4742debcdf3bbf084b15d68e01d41

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