Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4437fca81fb3805…

MALICIOUS

PDF

90.3 KB Created: 2021-04-05 17:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a0fed19e2ed538a0b456f56ef9545c48 SHA-1: 97d1d7b223c303d25a56cf15da898fb508ff8765 SHA-256: a4437fca81fb380520c4fba779df8198054d9cd5def145c36c3e16485daa6d35
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 0.9992

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://zajinet.ru/strik?utm_term=first+alert+smoke+alarm+test+silence+button PDF link annotation
    • http://minesaxofunawi.getenjoyment.net/peavey_vypyr_vip_1_20w_1x8_guitar_modeling_combo_amp.pdfIn PDF document text
    • http://romeita.fun/idsa_hiv_treatment_guidelinesjmxne.pdfIn PDF document text
    • http://changepass.online/ladizenuwaxexim6ui0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414156/normal_5ff29ca139ba6.pdfIn PDF document text
    • http://sunmarkt.ru/wusonitekiguxuxexa73snl.pdfIn PDF document text
    • http://zhk-rekord.info/how_to_get_a_toned_stomach_and_bigger_bumgis0j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369525/normal_5fcea8f4c5b4c.pdfIn PDF document text
    • http://mufutekuson.getenjoyment.net/merchant_of_venice_act_4_scene_1_translation.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/57764692191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446643/normal_60140a44c6f3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_60414365d27a1.pdfIn PDF document text
    • http://reduslim-officialsite.site/negigi549d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425933/normal_601a0de25339d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_5fd8384c13030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_602c219a7c579.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408599/normal_5fe3125eea5eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446512/normal_5ff311b758167.pdfIn PDF document text
    • http://znatural.space/transmission_line_theory_bookssp2dj.pdfIn PDF document text
    • http://gufutaca1.xyz/how_to_trade_on_coinbase_with_zero_feesiyzyv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zimofizamar.epizy.com/introduce_yourself_paragraph.pdfIn PDF document text
    • http://xonelamurojili.rf.gd/voiced_and_voiceless_sounds_chart.pdfIn PDF document text
    • http://miwusox.rf.gd/banking_maths_book_free_download.pdfIn PDF document text
    • http://nunejodututote.epizy.com/lagu_tari_bedoyo_segara_kidul.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/27333832541.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_off0001220e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220E 5104 bytes
SHA-256: 3446883978ac62afc4d98d63599b5ead862093054d493e8e6f214a11a0498c4c
font_01_sfnt_off00013358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13358 11452 bytes
SHA-256: a89c90dac85e53b57d83e025946bd2c326896589f963429fcd39f37f0f15630e

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