Malicious PDF — malware analysis report

Static analysis result for SHA-256 97956a7edf3fc9d6…

MALICIOUS

PDF

88.2 KB Created: 2021-06-10 12:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8cd0ca2de8334550e76b60590faea80d SHA-1: 13ba34395d0e4bce10ea4015c2c49443549a49fe SHA-256: 97956a7edf3fc9d6f91a6d2aabf68e60b8636f6a1648a50c436120a3059b48ba
186 Risk Score

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 0.9991

Heuristics 6

  • 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.
  • 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://crysiq.ru/pbw?utm_term=carson+dellosa+cd+4301+answer+key+spanish PDF link annotation
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/1918772.pdfIn PDF document text
    • https://matopudalerem.weebly.com/uploads/1/3/5/3/135318895/825d10a3fbab.pdfIn PDF document text
    • https://gotakepe.weebly.com/uploads/1/3/4/7/134763382/tiwobopuferibog.pdfIn PDF document text
    • https://mozubuwuvufizo.weebly.com/uploads/1/3/4/6/134600540/mefujagami-kawel.pdfIn PDF document text
    • https://giwaxevo.weebly.com/uploads/1/3/4/6/134644090/domodabag.pdfIn PDF document text
    • https://jedujubopo.weebly.com/uploads/1/3/4/5/134521244/216953.pdfIn PDF document text
    • https://sazaburesifug.weebly.com/uploads/1/3/4/2/134265765/bemamuzalu.pdfIn PDF document text
    • https://bakijowo.weebly.com/uploads/1/3/4/7/134726649/jonawasejukanir.pdfIn PDF document text
    • https://pasesanirir.weebly.com/uploads/1/3/4/6/134649367/desizoxepema.pdfIn PDF document text
    • https://zuziraluxir.weebly.com/uploads/1/3/4/8/134899121/0b6d2b6101.pdfIn PDF document text
    • https://gonutorimi.weebly.com/uploads/1/3/4/5/134590267/9555416.pdfIn PDF document text
    • https://gedenotovet.weebly.com/uploads/1/3/1/3/131379555/sewejeged_jexotatibu_xukak_sanofenagu.pdfIn PDF document text
    • https://nariwezug.weebly.com/uploads/1/3/1/4/131482968/3936479.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/941c981f-b326-46ab-81e1-2d609af95138/sobalosinuxexalewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259d1fcd-5aa5-4229-a217-97cf428b1ceb/ejercicios_resueltos_de_identidades_trigonomtricas_para_bachillerato.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9dd48b8-931a-4c86-a76b-6e4a92f427c1/25320629822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ce5bd7-eb5d-4151-91e1-b4542b754595/ms_dos_commands_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f314c60-2715-4f5a-8ad2-14118ce2d2c0/pillsbury_pizza_dough_cooking_temperature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb1b082b-da69-4d47-8367-e7e9c029f042/pokemon_ultra_sun_and_moon_qr_codes_that_give_you_20_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbd939cd-0052-4c72-80c4-09389d33076a/what_kind_of_compound_is_potassium_nitrate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5271fbd-c95e-4e9c-ba0d-8431d8e6f08f/wh_questions_reading_comprehension_worksheets_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73436eef-2ef2-4e31-9fdb-fbb86cdeae00/peluvifutewax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbe8c25-2fe7-4c09-a01e-b4ca1f6ae9ac/65929742521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7ec7ba4-7491-4039-88c7-94b5292e1bc4/sentinel_gun_safe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce52310-488e-4bf9-b660-23fd57465eac/skyrim_ps4_strange_magic_mod.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_off00011631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11631 5772 bytes
SHA-256: a969772f3ac178f08fd1ca9c7320d63fdda3e220e6a350a4ee72db4258746fe5
font_01_sfnt_off000129ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EE 12568 bytes
SHA-256: c53798491f30831cb1a1ff88fe4c99d5dc3737f2e5564df15a8af3a6746bc5a3