Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f9f47500af3ca4…

MALICIOUS

PDF

77.9 KB Created: 2021-03-13 19:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7c5aaa3d8da7c08298335b52024a974d SHA-1: 00fb2bf5b2b560fcb835fea21a64eb8231010868 SHA-256: 90f9f47500af3ca4bbf6d7de52bd09581993b3f53e18ed8e6164812039bb57ac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded URLs, with a primary focus on a link to 'midufefew.ru' disguised as an educational worksheet. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

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://midufefew.ru/123?utm_term=ascending+order+fractions+worksheet+with+answers PDF link annotation
    • http://xelamoxadavas.mywebcommunity.org/23608073204.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/valikarenefowukenuw.pdfIn PDF document text
    • https://lisogawe.weebly.com/uploads/1/3/5/3/135312855/dukutobuzona.pdfIn PDF document text
    • http://zoom-omsk.ru/92057041516rf0he.pdfIn PDF document text
    • http://greatholl.com/57029929361oqocq.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/top_startups_2020_london.pdfIn PDF document text
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/taxiju.pdfIn PDF document text
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/tagiduwir.pdfIn PDF document text
    • http://tezoxefakalexo.sportsontheweb.net/stihl_ms310_farm_boss_price.pdfIn PDF document text
    • https://butopejejix.weebly.com/uploads/1/3/2/8/132814220/dinokuzalikebez.pdfIn PDF document text
    • http://tuvivukaroj.mygamesonline.org/xotugojop.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/netinuwa/egg-_shaped_crossword_puzzle_answer.pdfIn PDF document text
    • http://rojegasofibi.epizy.com/60693624839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a89dd2b-a0ea-4b63-8c5f-52c6aad988f7/27988581640.pdfIn PDF document text
    • http://wuxigukupem.epizy.com/relief_society_birthday_celebration_ideas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4742d91-1699-40b0-9f87-8a8c2b8bee7c/arnold_encyclopedia_of_bodybuilding_free.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/devuxonegufawofipakif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aa475ca-6791-473c-804a-5f4d519db221/mantis_tiller_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfb8a9ad-464d-46e7-a3a8-98fa92110249/sozibunegup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3fab47d-60dc-41d7-b288-63026e4f1571/to_shoot_an_elephant_film.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_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 5396 bytes
SHA-256: 986a2a6c60d80070b6a970637606db734230173ca87fe7965e086906651986aa
font_01_sfnt_off00010233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10233 11684 bytes
SHA-256: 564be381becda77b319625648431cf1a78518ce90c4929233e4894a8d1aab2a0

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