Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9339576237cc3fc…

MALICIOUS

PDF

75.8 KB Created: 2021-03-27 20:47:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: cac65bda6fb5c5425e4fed6c568fa601 SHA-1: 8016022f8f3937d4d5ce189ae18276f6d7d8d085 SHA-256: a9339576237cc3fc87fd8c5efdbcb649ba017a314b8159d36e7c7888d783d773
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 0.9998

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 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://soxebez.ru/award?keyword=cambridge+english+qualifications+pre+a1+starters+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479214/normal_603d43a787646.pdfIn PDF document text
    • http://jepisafidezegun.scienceontheweb.net/depugejalegegosanil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447497/normal_5fcacbedc23b1.pdfIn PDF document text
    • http://gijaninapumobe.sportsontheweb.net/2020_afl_fixture_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415544/normal_600aaf8ce9f6e.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/votubukaxogilix/cutest_babies_images.pdfIn PDF document text
    • https://54179944-c6a3-49b3-9462-5d1939b6aff2.filesusr.com/ugd/49f5ef_ee86f4415fe646f3b97b7f6e7a6b6ae7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4910938-834c-4642-a1f6-2cf5d6cbceca/31847402128.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/free_auditing_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00c8561e-e67f-4e2d-a590-189c92698e63/vanafuvirupixis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05434f87-dd76-49ac-8dfd-30985b101a9e/dometic_15000_btu_rv_air_conditioner_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/najubu/80065379614.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea9b79b-7ac8-4fed-9599-5aa7590a29bd/tanaxaluropuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a36637d1-366f-42d8-97e6-396af6296083/30793738961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/643d7734-878e-45c8-9c66-97dc6b370565/the_eight_limbs_of_yoga_poster.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/android_developer_mode_mock_location.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6991d362-74d4-4c5e-b32f-fe6be34c643f/roland_td_11_manuale_italiano.pdfIn PDF document text
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_ca487981b2264147b944f86b3a9ca0d1.pdf?index=trueIn 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_off0000df30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF30 5792 bytes
SHA-256: 62a41ac65ff7ea1c96cc68962384a4d36224b6c6a0cdd5dc2140cc817b8723cb
font_01_sfnt_off0000f2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AB 18804 bytes
SHA-256: 190a32b700bca9080a1e2876d5000cfa4e0f2fddc73b6d6a747f4d02d420a111

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