Malicious PDF — malware analysis report

Static analysis result for SHA-256 612bed4718d791ae…

MALICIOUS

PDF

77.8 KB Created: 2021-03-27 20:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: efd1781f89d1383c8d2087d0b6736e98 SHA-1: c05af6c478ff31284affd4957de146b060414bd4 SHA-256: 612bed4718d791ae6e30e4bc3ebc149f5315afe7f1b39ce82bbeaeaa427a3af9
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 0.9993

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://golowaki.ru/123?utm_term=employee+attendance+sheet+excel+template PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5ff53a2730f6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fe40d8eb72c3.pdfIn PDF document text
    • http://promoocaoameericanas.com/22101821094auz44.pdfIn PDF document text
    • https://cdn.sqhk.co/bugolajoxodu/deciRgf/30112980653.pdfIn PDF document text
    • https://cdn.sqhk.co/sajatanugeg/hcjeplz/zufakudizamomofipu.pdfIn PDF document text
    • https://cdn.sqhk.co/daborofus/jhCjehf/78630962149.pdfIn PDF document text
    • https://cdn.sqhk.co/napumefu/irTr6gb/bendy_minecraft_mod_apk_v1._16._1._02.pdfIn PDF document text
    • https://cdn.sqhk.co/femokuxajuz/jzmQ7ig/business_growth_strategies_examples.pdfIn PDF document text
    • http://damvglaz1.xyz/hp_officejet_pro_8600_plus_ink_cartridge_access_doorcscdm.pdfIn PDF document text
    • http://zumewidife.mygamesonline.org/68105434947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384036/normal_601fc43c46193.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_c0f54ddbdd7145489091293b4fb18a19.pdf?index=trueIn PDF document text
    • http://vigexosav.myartsonline.com/36934016315.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/31544009128.pdfIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_73730edc7178466b943de0f3f9df2133.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zetubakuz/plexiform_neurofibromas_pictures.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_c89f604ab65b43ecb98bab73eac7b17c.pdf?index=trueIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_ebec41809ef5422db8c86c01cb995f7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/73064776150.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/action_adventure_games_free_for_android.pdfIn PDF document text
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_b5ed5feadcb74cbfb52ae79d9b794d02.pdf?index=trueIn PDF document text
    • http://manosotidokef.myartsonline.com/subject_object_pronouns_possessive_adjectives_exercises.pdfIn PDF document text
    • http://pidodexogejax.myartsonline.com/71491718157.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_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 5344 bytes
SHA-256: cef43484a891876506b9d06a5df64ebdcb938458f90bdf8df3b6238ff3fe2060
font_01_sfnt_off0001069b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069B 10264 bytes
SHA-256: a2db8daa5a5a5e1db3dbd9bfce361dfcf8879e49cfdc887e3930a46df844d9cd

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