Malicious PDF — malware analysis report

Static analysis result for SHA-256 4452ac16ef19a390…

MALICIOUS

PDF

84.1 KB Created: 2021-04-05 02:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3fe68cc11c9faaa89f1fadbfb045e9dd SHA-1: 7343cd68d41503337c34b70c39a65a0065759785 SHA-256: 4452ac16ef19a39011bcc0d12f3e53c8d531b3fa3b62a867172858244a396123
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 0.9990

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/aws?utm_term=what+of+this+goldfish+would+you+wish+sergei PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387033/normal_5fccffc533e54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453891/normal_6064c8287ac2a.pdfIn PDF document text
    • http://dawexefif.getenjoyment.net/read_person_like_book.pdfIn PDF document text
    • http://carbackseat.site/simple_algebra_substitution_worksheets7zvff.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/fihZ2jd/cnc_router_free_designs.pdfIn PDF document text
    • http://5coupon.info/sennheiser_rs160_rs170_hdr_160_hdr_170_headphonesqe33f.pdfIn PDF document text
    • http://pasetbs.xyz/ge_troubleshooting_phone_numberkf08i.pdfIn PDF document text
    • http://bepelisufozasep.mywebcommunity.org/arnoldo_hax_delta_model.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369912/normal_5fc80e57327f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_6048c37fe7aee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424997/normal_60652e657c901.pdfIn PDF document text
    • http://rimarilomikozu.medianewsonline.com/288440372.pdfIn PDF document text
    • http://volosaty100.xyz/nutritional_information_beef_barley_soupho4uo.pdfIn PDF document text
    • https://cdn.sqhk.co/jetuzama/g9RuiJf/guidewire_insurance_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/nimuxugemu/0zgdiiM/rutuwepo.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://s3.amazonaws.com/savifin/after_effects_glitch_effect.pdfIn PDF document text
    • http://lewomunenuvi.myartsonline.com/amoretti_sonnet_79.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/bagozid.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/what_are_the_basic_principles_of_humanistic_psychology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a6da77c-565f-4881-af08-701eff4713fa/89247173147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fce2348c-2d43-47b7-befb-9f5e83d0b187/fe_reference_handbook_10.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc483e3d-950a-48dc-86dd-98bce13ee7fe/how_do_you_demonstrate_cultural_safety_in_the_workplace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef73e342-2ca9-4cab-bddb-4e1104b8fa43/how_much_does_young_living_oils_cost.pdfIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/88626519021.pdfIn PDF document text
    • http://tuxefunuzire.atwebpages.com/econometrics_for_dummies.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_off0000fdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB5 5152 bytes
SHA-256: 84083b89a877506b0dff67912c94d85e7f48f6fdb633d468d14ed8c3842795d3
font_01_sfnt_off00010f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F69 10884 bytes
SHA-256: 416e8e64a0eee17f419ecf4e6f2d65e752053da17e40a34db1a7901dbc02a294
font_02_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2