Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4eea1c25d0a8942…

MALICIOUS

PDF

77.3 KB Created: 2021-04-06 19:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 23aa34122817a58a7f5f505ad28d46e2 SHA-1: 1d94edaaf19751544eac1a4f12047625663f380b SHA-256: a4eea1c25d0a894222637faa0a5aa55a6a3707d387c31d1cd55930f9a14ecb6e
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://xezojetit.ru/123?utm_term=sistem+akuntansi+pemerintah+daerah+pdf PDF link annotation
    • http://povogotavapa.22web.org/interesting_facts_about_universe.pdfIn PDF document text
    • https://cdn.sqhk.co/pibigovaxavu/KMicggH/sia_helium_piano_sheet_music.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447093/normal_5fe8d0c079e1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_604a4ee9248b6.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/dijfghd/origami_crane_meaning_for_weddings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_60388c9b57494.pdfIn PDF document text
    • http://juwijosij.iblogger.org/guia_canales_totalplay.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumolak.rf.gd/zogivifiputemotogolufejez.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/aflac_group_critical_illness_health_screening_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a80e53-7864-4f71-8d4c-f756a20066ec/does_diethyl_ether_have_a_dipole_moment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5540b287-5fb4-4df9-b321-02a4fbda366d/gisuxa.pdfIn PDF document text
    • http://ronizinit.epizy.com/upfront_magazine_answer_key_china_goes_back_to_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/329989be-d9ed-4f78-8071-b384de907f5f/39562181446.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3dfe1e5-d7a7-4877-80bb-cf237166a7f7/the_rabbit_who_caused_all_the_trouble.pdfIn PDF document text
    • http://savurokew.epizy.com/antenatal_physiotherapy_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f418574-bc1b-472b-ac8a-f9bc8a58d33c/97417740713.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b63e5ee2-a3e5-453e-8e92-0860745f7652/98692808033.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/logo_game_answers_level_36.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_off0000f02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 5416 bytes
SHA-256: db63b564f09f4d44c7e814e311f0a0799c4f2aaeca1a492a75636f066ecfc94a
font_01_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 10528 bytes
SHA-256: 464ffb4ccf745e1ab2115f4846e2f2acb1f2c7f46b561fbb4b0af446d9424646

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