Malicious PDF — malware analysis report

Static analysis result for SHA-256 815f8bdf4d7b6e40…

MALICIOUS

PDF

72.4 KB Created: 2021-03-30 19:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7ae53a3e793d7813a91be8e6a6e33baf SHA-1: 5520d16918608a5dc97767ca2a0b6f8988b74c3c SHA-256: 815f8bdf4d7b6e4003d1e5f1da8ac91dffde32a65fac68c331cbe7de0976c321
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://leonvi.ru/award?keyword=articulos+definidos+e+indefinidos+worksheet+pdf PDF link annotation
    • http://zobebukore.22web.org/my_singing_monsters_breeding_guide_bowgart.pdfIn PDF document text
    • http://ropewelopison.iblogger.org/free_blank_staff_sheet_music.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/24871612448.pdfIn PDF document text
    • http://waduresiwiboba.iblogger.org/18143823829.pdfIn PDF document text
    • http://juwaniwabi.medianewsonline.com/kiwedufewuvag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475588/normal_601a44f423c34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365562/normal_6004b280ebb08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477637/normal_60001c418925b.pdfIn PDF document text
    • http://refajunabewatog.iblogger.org/single_candle_images.pdfIn PDF document text
    • http://naxajogilelog.medianewsonline.com/35109663985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_b3f4b5d85ad44378aff38b85dadcdc72.pdf?index=trueIn PDF document text
    • https://a5f97fb6-6895-4a42-8c51-2de4018fe37d.filesusr.com/ugd/1eae48_c5f259b330e34224aa85b23421171aa3.pdf?index=trueIn PDF document text
    • http://visevagopar.onlinewebshop.net/basic_simple_english_sentences.pdfIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_ce26de9eba2e4ee89cb8d8519df0d915.pdf?index=trueIn PDF document text
    • https://493f174a-a540-412c-bacb-e5b7b26cbfcf.filesusr.com/ugd/95bb70_3c528d6dac224bf8921468e015a6af21.pdf?index=trueIn PDF document text
    • http://jufalusa.rf.gd/dozagadojobibodaxokoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/zezememujoruduxolujivi.pdfIn PDF document text
    • http://vazuvipib.rf.gd/lagu_hanya_rindu_versi_remix.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/liquido_amniotico_2019.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_546d6e52768e4a92989620097b1a81a3.pdf?index=trueIn PDF document text
    • http://darelarara.epizy.com/degudapanisuluwutati.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_off0000dd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD09 5180 bytes
SHA-256: 2b711d821cd0a261986de47c2fbf2ba9b7f164ed068f241d982469ebbc7f6a67
font_01_sfnt_off0000eebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBB 11544 bytes
SHA-256: e8bd1994381ff479e4c63983009c1a9d9a4649631a41e8fc9d98a53ecf5da398

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