Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0698a3ca828892…

MALICIOUS

PDF

181.5 KB Created: 2021-04-02 19:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fb343ce8056bd4fd32ca9503e91e1cde SHA-1: 166fd04997e764b57d6ef39052ce5cc06b590117 SHA-256: 9a0698a3ca828892ce42ee129140b986962b3da51f2c01d2b1207b0ca27a3931
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('botokaw.ru') that is flagged as external. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm on disposable hosting, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://botokaw.ru/award?keyword=elementary+school+vocabulary+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384851/normal_602fffb483dd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380210/normal_5ff7a1a89e8bc.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/HyAviaQ/best_romantic_song_ringtone_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xolokenuw/1Hcxhf9/627119554.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/hjsigcl/kpop_rappers_ranking_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/pgiiheO/25184401076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372101/normal_5ffacc1bc331b.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/chisChi/brain_stress_balls_amazon.pdfIn PDF document text
    • https://cdn.sqhk.co/ravusigi/INBjgdb/miami_university_of_ohio_tuition_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/tuwesedujila/cujdKid/77522314220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fca51e50312e.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://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_66b7597680274fb19c3419845b715c27.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/546102c7-cb2c-4ebf-8067-bcfd83b4cb95/how_to_use_a_swingline_electric_stapler.pdfIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_c10294f9bd2448ed8999ec2a875d9855.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d361094-005f-4b71-977f-e91c2abe36e9/interior_designing_short_courses_in_karachi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc371f4-0f09-4083-8420-3a5beadaff66/did_humans_live_with_saber_tooth_tigers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70860a7c-666d-4881-933e-fd54ad223639/what_will_a_dehumidifier_do_for_my_basement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a063bf1e-f1a2-4eae-be8a-7bc43a09533f/xamefonaponogow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7a18555-4ebd-4dea-9b70-36b76c43e4a0/xotojemumusojefuxure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b98fcc1b-a176-4843-92e1-f95954ddb15e/what_is_the_meaning_of_literary_theories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b11b4f89-eda4-4595-909c-475ee4e8c792/saxosuzojevotox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/625f8ff9-8a66-4596-8a18-e52c6bad0844/51899223544.pdfIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_1981e1646e574377b313918a17c78598.pdf?index=trueIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_4284cf3a83e645a2886c88006483257e.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_4ba0ae66015e4541afbf7e7d4440338c.pdf?index=trueIn 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_off000280b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x280B2 5488 bytes
SHA-256: a5ae4e675adf222e8d1cd3730a558ae99d43467f1039081ec24c7278a6e0324e
font_01_sfnt_off00029332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29332 11328 bytes
SHA-256: a1313af5edc5264620736168d922da35bf12c08af4778b05c3e4c27f9c741dec
font_02_sfnt_off0002b926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B926 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333