Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e2abd5e94770592…

MALICIOUS

PDF

74.1 KB Created: 2020-11-10 21:23:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: db1baebf6abc9a4802e3f4d7df751533 SHA-1: 9c733b002eab2e028a11b5340900cd47cfaf7a0b SHA-256: 4e2abd5e947705927b6ab2878fba59ba2c4d37fed260d0ce63f69eda1ccfefe6
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 0.9996

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/strik?keyword=resident+evil+2+remake+android+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375704/normal_5f897c5f4dab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_5fa03b6964c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_5f894d73e3219.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f878228016d7.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/sozomomowo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407084/normal_5f9a649b13d00.pdfIn PDF document text
    • https://fipaziditude.weebly.com/uploads/1/3/4/4/134465794/b3c04150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376854/normal_5f92e07e562f3.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/bulolimepol/sisamekelimodopopisove.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/livre_nutrition_sportive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25ef3d4e-decb-45ac-8dc8-86a39034a5fd/sonic_bts_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79caf680-e10a-4c0d-91fb-189bb1258faf/jedazegepifokavexudabubib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30905e52-0ada-4022-a395-a0f9c6691200/world_conservation_award_v2016_scouts_bsa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000c77f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC77F 5864 bytes
SHA-256: 824514bb269ae748a76274c19672c950252f3dd73ea63e617bae0fe4798bd076
font_01_sfnt_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 5368 bytes
SHA-256: 3828b1e55847aa7a1192540248fd1992115c3024cfb4679ab4dc5537ccf0bf1f
font_02_sfnt_off0000edd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD9 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_03_sfnt_off0000f666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF666 10904 bytes
SHA-256: b1873a912c1ce7306065e418b025dbeb485aaf144cfdc9ebb583a88f2e951ab9

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