Malicious PDF — malware analysis report

Static analysis result for SHA-256 bedc2e7c82e1aefa…

MALICIOUS

PDF

75.8 KB Created: 2021-03-04 09:58:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 822b2e76f9bd0a71ccc21c4089c19ce8 SHA-1: e2e1f87c8113aa4d130e28a48c0a2d615661a1d4 SHA-256: bedc2e7c82e1aefafda894346a070ec056184972a3caf5fe4b06968b89022e2b
156 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' containing 30 links. The presence of embedded URLs and the general structure suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dugedepap.ru/wix?keyword=creo+simulate+student+license
    • http://lebizifijafaxim.medianewsonline.com/how_to_get_bookshelves_fast_in_minecraft.pdf
    • https://static.s123-cdn-static.com/uploads/4443372/normal_5fce2dac8c41a.pdf
    • http://buwubaled.mywebcommunity.org/mawexedoxilixuvox.pdf
    • https://static.s123-cdn-static.com/uploads/4387424/normal_600731cd432e1.pdf
    • https://kaseloguxov.weebly.com/uploads/1/3/1/4/131406527/zoludukejanime_vupirig_busulawed.pdf
    • http://zeboxagekej.sportsontheweb.net/how_to_answer_interview_questions_for_a_medical_assistant_job.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zifilobesumafi/zezax.pdf
    • https://s3.amazonaws.com/xukirizugukugi/arcgis_pro_import_arcmap_templates.pdf
    • https://s3.amazonaws.com/ropidadegaxut/41923318270.pdf
    • https://s3.amazonaws.com/pilazi/format_of_a_letter_in_spanish.pdf
    • https://s3.amazonaws.com/kawotexulozax/what_to_do_when_your_washing_machine_wont_spin.pdf
    • https://s3.amazonaws.com/medaliwifufugel/what_is_the_difference_between_printable_vinyl_and_sticker_paper.pdf
    • http://bunisanabasa.epizy.com/lotadipofizokibetunu.pdf
    • http://lobopekogolo.onlinewebshop.net/how_to_get_phthalo_green.pdf
    • https://s3.amazonaws.com/rovuweraja/can_distance_and_displacement_be_the_same_magnitude.pdf
    • http://fusiwati.epizy.com/24096551050.pdf
    • https://s3.amazonaws.com/xamapebonijos/android_mobile_phones_unlocked_australia.pdf
    • https://s3.amazonaws.com/welanisowari/arabic_fonts_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed88.bin
f5024d5a99908cfc1e7c2c1f32708e4a2915cbee43de70661e96101d5d999849		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED88 4992 bytes
font_01_sfnt_off0000fe5e.bin
a4d9ba61141c49e7d6dc95333b188ae63f5d0389c2a87957efca5da226bbc88a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5E 10724 bytes

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