Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8077f45e720fbf3…

MALICIOUS

PDF

80.5 KB Created: 2021-03-21 10:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1a2c0c6c34f1780b3f20db6794483f31 SHA-1: 72aa7c0b0123e9c44cdb4a4ab50897213106a28d SHA-256: c8077f45e720fbf31f0176a50bb29ad1f885668fbd917a583d4bdd575ba4c0ce
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=banner+background++link PDF link annotation
    • https://cdn.sqhk.co/widiroje/eghuieI/rimivikitoruwa.pdfIn PDF document text
    • http://medefoduma.iblogger.org/what_does_lamina_mean_in_physics.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/ijjgidc/malamute_puppy_running_gif.pdfIn PDF document text
    • https://cdn.sqhk.co/mipijotom/njaiaax/sipaxeloxaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf8e2b5b-156d-4290-9227-99675fb56019/inevitable_desastre_cuantos_libros_son.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/zisoxegabosam.pdfIn PDF document text
    • http://kitojob.epizy.com/free_ableton_live_8_trial_version.pdfIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_d80ee8e7008444488acd4b3e2814441f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rerinago/76602744758.pdfIn PDF document text
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_fdff701454914d7ebbfa18ddcc6da20c.pdf?index=trueIn PDF document text
    • http://voroxufitunugu.epizy.com/59383932252.pdfIn PDF document text
    • https://0ed7c29b-d5f2-4290-8b47-add6aa38300d.filesusr.com/ugd/32a223_ecfd47629fad44c6868b330d46e630d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/self_discipline_in_10_days_summary.pdfIn PDF document text
    • http://fasokefukolu.epizy.com/sosilaxadozu.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/lease_agreement_format_word.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/randolph_stone_polarity_therapy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca212951-92ac-4d96-a89c-0fe850eeefef/what_is_the_lesson_in_a_midsummer_nights_dream.pdfIn PDF document text
    • https://s3.amazonaws.com/tikoweravisixu/spelling_for_grade_3_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/birthday_wishes_song_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/visuxomobelu.pdfIn PDF document text
    • http://desakoda.rf.gd/atlantic_hotel_sail_city_bremerhaven_aussichtsplattform.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/podalijitegotitave.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_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 5184 bytes
SHA-256: d0fda3cc9e8504349f09e0eba690667d3312d44054cd0e023fec2369d6d4474b
font_01_sfnt_off00010f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F56 11052 bytes
SHA-256: 0107e9d5077abca050ef0d21dde43a4cdff98f57040cc3906730d39952297d9e

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