Malicious PDF — malware analysis report

Static analysis result for SHA-256 d629585b05cd80ac…

MALICIOUS

PDF

74.3 KB Created: 2021-03-25 08:59:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c1d4a560fc113a87dfc8877b79c75f79 SHA-1: 9a94abe23e8ce8efa181db0de0a5d88ec04932ae SHA-256: d629585b05cd80ac266264be11552f8f366eca8a1171778f7b9bdde59e77c665
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://gimoguvi.ru/wix?keyword=integers+and+rational+numbers+worksheet PDF link annotation
    • http://wasatosu.sportsontheweb.net/vikegelivusip.pdfIn PDF document text
    • http://jigikujed.scienceontheweb.net/jetaxoxan.pdfIn PDF document text
    • http://jemerujaw.22web.org/lubim.pdfIn PDF document text
    • http://gizesodawesiv.mywebcommunity.org/bronchopneumonia_pathophysiology.pdfIn PDF document text
    • http://paxabak.mypressonline.com/wedifelebimemaxufogip.pdfIn PDF document text
    • http://wavapivanuf.scienceontheweb.net/basel_3_pillars.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/riwuv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd11acb6-7b4e-4acc-b4fe-a1a12d816103/tipifexanilujalozaf.pdfIn PDF document text
    • http://vizumun.rf.gd/87717010389.pdfIn PDF document text
    • http://givetupazowo.onlinewebshop.net/multiplication_puzzles_worksheets.pdfIn PDF document text
    • http://zaninenuj.rf.gd/buzububisemisabomoweto.pdfIn PDF document text
    • http://sokekakeloji.onlinewebshop.net/wosudepixelewep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75cb9795-2cb4-4766-b69d-fe1c809363e0/stein_on_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4cc1cab-f268-445b-817a-19d18017f5be/ba_ii_plus_online_calculator_download_mac.pdfIn PDF document text
    • http://vekejuf.atwebpages.com/camarilla_v5.pdfIn PDF document text
    • http://jagutebi.epizy.com/book_like_48_laws_of_power.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b7f010f-2d40-4b8a-9832-6775fa57de09/berixumomezog.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/najadavatesiguzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3afaf30-7bea-4053-8c7c-9a090b89b48a/the_hound_of_the_baskervilles_1983_cast.pdfIn PDF document text
    • http://tiwatimab.atwebpages.com/37400298825.pdfIn PDF document text
    • http://jumuvurerurulap.rf.gd/ardy_cape_1_guide_osrs.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_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 5472 bytes
SHA-256: 5a4a21a550635c79b56244d0c6fe1c42f6387a64e99494f11095ac941daf8a23
font_01_sfnt_off0000f60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60A 11044 bytes
SHA-256: a51a5bb3641364522d271b7d71fd5e856f6f9c4714a6052152b59af9267d57a7

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