Malicious PDF — malware analysis report

Static analysis result for SHA-256 eff19db143dfe798…

MALICIOUS

PDF

88.0 KB Created: 2021-05-16 06:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 30e0c826f9dd1f54649c1698143bc1cf SHA-1: 9f1cf1d3c8d64ba52238f8db4ef697848d56de16 SHA-256: eff19db143dfe7981bc9d5b771511bd5c3e015f3510ec2f7feb4fb4b8cd57c43
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=guitar+chords+chart+for+beginners+with+fingers+pdf PDF link annotation
    • http://nibofope.66ghz.com/atcloud_for_pc_free.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/zopotojowilorapizas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367911/normal_60674206f1be3.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/nupugulosavujikebuxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451752/normal_5fd13b68287a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461761/normal_603342588196d.pdfIn PDF document text
    • https://kabosasano.weebly.com/uploads/1/3/5/3/135398154/19ddfade400.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
    • http://futikuzita.onlinewebshop.net/define_social_media_marketing.pdfIn PDF document text
    • http://poduzamilikuki.rf.gd/fafapivadun.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/bissell_vacuum_cleaner_belt_change.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/will_check_engine_light_come_on_for_transmission_fluid.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/fijusunudev.pdfIn PDF document text
    • http://tokezaja.epizy.com/66725864276.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/apprendre_chinois.pdfIn PDF document text
    • http://wivukirotodit.epizy.com/ashrae_refrigeration_handbook_2020.pdfIn PDF document text
    • http://nejegidijikoj.epizy.com/the_places_that_scare_you_a_guide_to_fearlessness_in_difficult_times.pdfIn PDF document text
    • http://sufofivisis.epizy.com/tumor_ovarium_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/32347724963.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/hayward_chlorinator_o_ring_lubricant.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 5532 bytes
SHA-256: 90c34e7dfa1afa240cb9855104cd271e2cc9e681c04504058d091e219012ab65
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 10748 bytes
SHA-256: 598b0c581374da52b66f4d4ae14e388ad2ea1b7772febff6caa20b968106bef3
font_02_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 16076 bytes
SHA-256: 3843e86183f501df8859981d7610fa40343104ecc6001567920a71972151aa82
font_03_sfnt_off000142a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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