Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fbedfaa045f43a…

MALICIOUS

PDF

86.0 KB Created: 2021-03-01 20:01:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e587d64f6517e51ed4b5dd172ac0cfea SHA-1: 1059a04f1d4e3bff09ae7fd35a544afaac6c08b0 SHA-256: d5fbedfaa045f43af02aa5fc28748faac4dc30b9389ea05cbffbfcb3e1c6698a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/aws?utm_term=starbucks+coconut+milk+nutritional+value PDF link annotation
    • http://begdas.space/dr_seuss_books_read_to_meldksf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446377/normal_5fd86d4da64bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466161/normal_5ffcc8db5afb0.pdfIn PDF document text
    • http://sosuziba.mypressonline.com/dork_diaries_birthday_drama_read_online_free.pdfIn PDF document text
    • http://itawegan.space/16944796081cfnrb.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/norcold_refrigerator_not_working_on_electric.pdfIn PDF document text
    • http://trujillostacoshop.com/daguwumvlxbw.pdfIn PDF document text
    • http://dorightunion.com/313093303244p8xo.pdfIn PDF document text
    • http://sy0n.icu/mugigenitofolivautlpt.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/stock_market_crash_2008_daily_chart.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/18942180600.pdfIn PDF document text
    • http://golomashvanna.xyz/40141250507wlok3.pdfIn PDF document text
    • http://pubgucbayim.com/nefidefozejalowevzw4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488842/normal_6034bf3194266.pdfIn PDF document text
    • http://baugroup.info/que_es_liderazgo_segun_autores_y_aos3a29.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/daraniwekamidir/8732405163.pdfIn PDF document text
    • http://gekolutewubel.myartsonline.com/8946027718.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/gidijudolosu.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_off00010f43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F43 5312 bytes
SHA-256: 56bd42c5ae608345062324e37d2d5bc9c9d0e160a83d337cbe57238f95085bdb
font_01_sfnt_off00012146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12146 12576 bytes
SHA-256: 7db2b48f1036e8316656dba24159c21a0e43a7c702edcc4e503318b8a536fd5a

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