Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5961c871e613c6…

MALICIOUS

PDF

85.1 KB Created: 2021-04-07 21:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 15f729a25972edd4ad6c3901f3a95ab1 SHA-1: 559f51611e2ed3de45aebce414d2464887864e0e SHA-256: 4d5961c871e613c64a273798354b3d5e4f2d4d1b16c5fbe8e16a95f22647c545
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://botokaw.ru/123?utm_term=wallpaper+anonymous+hd+untuk+android PDF link annotation
    • https://cdn.sqhk.co/dagozuwemep/4jyshfu/dunapimavoku.pdfIn PDF document text
    • https://cdn.sqhk.co/gitovera/1tbIZhf/wetejavigubonomuwazaku.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/ea405974-37c2-4f76-8218-e5f304bee23a/48332511034.pdfIn PDF document text
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_4122b61710e048cebbef22c85ae404c7.pdf?index=trueIn PDF document text
    • http://nejesezape.myartsonline.com/26810634544.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/free_travel_agency_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/sejakopa/nine_algorithms_that_changed_the_future.pdfIn PDF document text
    • https://f9fc249e-2e6a-4908-9eb0-88005465a50d.filesusr.com/ugd/2530ee_78d2b479040b4ac881e1e8b784e4e219.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazivemon/40028517193.pdfIn PDF document text
    • http://bidusibebawuz.onlinewebshop.net/regrouper_plusieurs_en_un_seul_gratuit.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/6150372635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3927e8f0-1e26-4d0c-81d0-9977049917b9/call_of_duty_ps4_store.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/37923048126.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/99917374835.pdfIn PDF document text
    • https://s3.amazonaws.com/jarirotexab/44836123590.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/affectiva_q_sensor_manual.pdfIn PDF document text
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_b3b607daeed9445492f5a687fbc2613a.pdf?index=trueIn PDF document text
    • http://relivoziz.atwebpages.com/cancer_de_prostata_articulo_de_revision.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93222777-6cb5-4a0c-a082-bcfd87f7b2bd/76318418775.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/mathematical_physics_book.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_off00010bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFC 5380 bytes
SHA-256: ec64e42e8d965d16d1f1a1f2034cbadafeabf0f2288065d198dc93131640f88f
font_01_sfnt_off00011e2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2B 11572 bytes
SHA-256: dd7437069f03b96e55f9bd1d2811011f2411cb045de20719457daf1273021498

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