Malicious PDF — malware analysis report

Static analysis result for SHA-256 3019c3138fd191f9…

MALICIOUS

PDF

93.8 KB Created: 2021-05-20 07:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a7edd631bec52c7887c12ef94bbade06 SHA-1: 1b4d99a2b3158d39008613410b545054f5be4b34 SHA-256: 3019c3138fd191f9ae8b67613c7d5c97bae519c5a229606b8fc9c0351eed8323
126 Risk Score

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 0.9995

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://dafemum.ru/strik?utm_term=circle+theorem+questions+and+answers+pdf+grade+12 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368246/normal_5fefd099b7c60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403687/normal_5ff64b5238abf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477155/normal_5fda322962e9d.pdfIn PDF document text
    • https://dimenitajobe.weebly.com/uploads/1/3/4/4/134444553/tevidevu_fulazisipop.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/501103.pdfIn PDF document text
    • https://xatiletovolut.weebly.com/uploads/1/3/1/4/131409128/8580176.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_60392c9b30376.pdfIn PDF document text
    • https://towuzisutodugo.weebly.com/uploads/1/3/0/9/130969847/rejoxijo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476783/normal_5ffe8e8a11b78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/91e26d48-a98a-46fc-bc4b-889311374f58/credit_score_range_experian_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83d71fc4-901b-46e0-b771-7ea7434182bb/gukulibuxekiwuxedovudapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbfb10f8-0e06-4f4a-b6d0-f969338b1c41/fedex_tracking_by_email_address.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/making_lasagna_with_dry_pasta_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/ballroom_e_youkoso_soundtrack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10091127-fb01-4205-bf43-16543f421f07/61276646327.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/avent_electric_4_in_1_steriliser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3565f764-7fd0-46cf-9ce5-d78e7f562173/zagiluzikukozumanodoxaziz.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/bazuwebuwuwesuzabize.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22fe4f27-2aea-4cf5-822c-df02622f360e/childrens_books_with_life_lessons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b57c9fca-6415-4c69-ad77-c5b0ee5e6c7b/how_fast_do_you_fall_asleep_with_general_anesthesia.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/xafatagakevu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1B 5876 bytes
SHA-256: 3a6320d359175d96b8363a9b7fa0eda736aeff4efa3b80f6d11e2cf29cd7ce3f
font_01_sfnt_off00013201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13201 12020 bytes
SHA-256: 63eda02c342fbf625027e9d17649b4fbd93efdda98007df491bb86f6ee356dba
font_02_sfnt_off00015b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B1D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176