Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c4d9c6efa48354…

MALICIOUS

PDF

103.3 KB Created: 2021-02-28 20:58:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0ce48610e6d9cb4fba702574f9bd7541 SHA-1: 7751e07f9880d10464f655e698679c8c13657488 SHA-256: b3c4d9c6efa4835476a81defa88063897949b9ae430fa19fa0101c5b8e3c7e4b
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, a common tactic for phishing and SEO spam. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, and one specific URL, 'https://mezovuduw.ru/wix?keyword=constitution+test+answers+2018', suggests a lure to a malicious site. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

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://mezovuduw.ru/wix?keyword=constitution+test+answers+2018 PDF link annotation
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/22b89e3.pdfIn PDF document text
    • https://kusavavatixe.weebly.com/uploads/1/3/4/8/134878613/3665d2a8fd9.pdfIn PDF document text
    • http://baffer-shop.space/me_before_you_movie_online_with_arabic_subtitlesjacub.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/5982769.pdfIn PDF document text
    • http://pugisapi.mypressonline.com/suwajokositewobobabi.pdfIn PDF document text
    • http://makeyourself.xyz/programming_arduino_uno_in_pure_cas16s.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/93947993881.pdfIn PDF document text
    • http://belldiscount.ru/transformers_fanfiction_bumblebee_voiceu5j3b.pdfIn PDF document text
    • https://woseluwimi.weebly.com/uploads/1/3/4/1/134131525/jewokegusu.pdfIn PDF document text
    • http://lelekelosutov.getenjoyment.net/werutazifowexe.pdfIn PDF document text
    • http://bosemefawixuwov.mypressonline.com/marvel_comics_free_download_in_tamil.pdfIn PDF document text
    • http://copyrightreports.com/orokin_cell_farming_2019giqtk.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/binomial_theorem_expansion_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zupitatip.atwebpages.com/tegidarixejaj.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/zelagifodonef.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/lucky_draw_number_template_word.pdfIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/android_10_update_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/bluestack_3_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/histogram_mean_median_mode_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/xezigolunina.pdfIn PDF document text
    • http://vilumepidiwego.myartsonline.com/bose_sounddock_series_ii_portable_digital_music_system.pdfIn PDF document text
    • http://duvodix.myartsonline.com/can_you_take_the_written_driving_test_online_in_mississippi.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_off00015a31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A31 5164 bytes
SHA-256: 0b725d8792cbf13d8589d432b21a5eda8a6d3f424efb4f8d9771ea8ab3cc8c5c
font_01_sfnt_off00016bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BDB 10428 bytes
SHA-256: 37c18d11f512c9cc0ae9376675a05b1e759cf35b7dc1fffb99c626527ca4783d

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