Malicious PDF — malware analysis report

Static analysis result for SHA-256 f16c1420fe447680…

MALICIOUS

PDF

87.3 KB Created: 2021-05-18 22:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1a5f39d4f7e9de2d87dbe5364c33e532 SHA-1: c932121268a71da70561ef54fd2ec62a9d62335d SHA-256: f16c1420fe447680bbf4e880edb3e1d188c7ca7469565ec2f4be11b9f6f071ff
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 0.9998

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://pelibifir.ru/strik?utm_term=planejamento+celso+vasconcellos+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4455914/normal_5fde33a10a5a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422893/normal_6008b9560d799.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377717/normal_60384ccbbdc22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369524/normal_5fd6d25d34ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481285/normal_606bed8e9c61e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443819/normal_601101a2473fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xutulatovemi.epizy.com/65779567966.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a05839d-33c0-4356-97c5-20a2c1590ee9/allen_roth_santa_ana_ceiling_fan_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cb5c9d0-c468-4ffe-8d56-86a9e69efebe/how_to_reset_time_on_an_armitron_pro_sport_watch.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/what_is_data_mining_in_urdu.pdfIn PDF document text
    • http://lusujukelod.epizy.com/angiology_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/17163076171.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/vomugutewarosidefexumiwev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23a3249-e93a-4147-bdcc-9d3266ed3144/why_does_my_sony_bravia_tv_turn_on_by_itself.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a724cac2-983a-46cb-8f63-b49fe9beaee5/91248036296.pdfIn PDF document text
    • http://zogujiduguku.epizy.com/gajug.pdfIn PDF document text
    • http://mavadapeganitew.epizy.com/my_way_piano_notes.pdfIn PDF document text
    • http://popovanepedi.epizy.com/walmart_black_friday_tv_for_88.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_off00011411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11411 5344 bytes
SHA-256: b3b9b4dd36e67b2db520525d3c220ca9269255d886cf9b3763b7f74fb93a81c9
font_01_sfnt_off0001263f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263F 13360 bytes
SHA-256: fc7c9eb6fa7b9d636b391919b69d8d886644100d04925eb65fc5424d759e64df

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