Malicious PDF — malware analysis report

Static analysis result for SHA-256 db0cc45e60d2be95…

MALICIOUS

PDF

74.8 KB Created: 2021-03-20 12:58:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c206b24550195b24c4d1860c697b1213 SHA-1: b70ba2db892ac20e61e7b8de0ac90646d5fbb395 SHA-256: db0cc45e60d2be954e27b9dd73b37f855665ea57ae901302c9ff66757ff23911
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 0.9999

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://druttle.ru/award?keyword=liquid+waste+management+books+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495973/normal_605036dd79825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_60465efa3c765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_604954a31b946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453327/normal_5fdf2b6d491f5.pdfIn PDF document text
    • http://blancer.xyz/pet_safe_dog_collar_not_workingol00f.pdfIn PDF document text
    • http://sreview.online/bosibokalekamilovekutadopfmuyl.pdfIn PDF document text
    • http://obschee.xyz/91344545604m1ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_600cea0c4cab8.pdfIn PDF document text
    • http://robinmani.site/download_epic_war_td_2_mod_apk_datafnlkl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481520/normal_5fd2a664a4e83.pdfIn PDF document text
    • http://igcopyrightforhelps.com/jegijolodimusanugny6k.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/577ea0d9-3d1d-4dc2-ba4f-939a978d6c7f/how_to_change_time_and_date_on_g_shock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f397a4-4d09-4d9b-9de1-566fb81c4aa8/42071283773.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cc342bd-5520-423f-a0c4-838d20178f35/tesla_model_3_interior_led_lights.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0aec4bb-5221-4c05-a67e-c65452e21ada/minuziguke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4235014c-b6ba-4a39-85c2-b852bc1d6112/how_to_put_ink_in_hp_photosmart_5510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/822045c1-ca86-4e8c-8e64-27955d2df92b/nojibuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9a21761-827b-4b7e-9de9-2edfc68fedc4/kolorowomom.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_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 5596 bytes
SHA-256: 7832482411d62d3fce935d1163f53a4d3c19807ea7e87acec99d6bc77dc1d6b8
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 10956 bytes
SHA-256: 448d2a9b5ef705e28d41e3af8a0ba88f7f2da314f434ee7dcde5eea9a089f758

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