Malicious PDF — malware analysis report

Static analysis result for SHA-256 c927d68a7776f2ab…

MALICIOUS

PDF

94.8 KB Created: 2021-03-15 11:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d038363a73eb06f0b3c41daaee99e74 SHA-1: 2e9449157cdcd00079583968e05b388f223c3f1c SHA-256: c927d68a7776f2ab013e9c7a8fe938214a7716ba724283d3b5b1356fcc2818b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicative of an SEO link farm or phishing campaign. ClamAV and ML classifiers strongly indicate maliciousness, specifically a phishing trojan. The embedded URLs suggest the primary goal is to redirect users to malicious sites, likely to host further malicious content or phishing pages.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/123?utm_term=mirae+asset+securities+usa+inc+annual+report
    • https://cdn.sqhk.co/jadepibake/qidGahh/18070537153.pdf
    • http://zememor.sportsontheweb.net/what_were_the_largest_cities_in_1900.pdf
    • http://mewudaguzexo.sportsontheweb.net/turofimobefelokunobafugir.pdf
    • https://cdn.sqhk.co/torazanopuni/7Jd6Phf/73288566905.pdf
    • https://cdn.sqhk.co/muwazubivotu/jagchai/xegamilumopal.pdf
    • http://xovebud.mygamesonline.org/26363065599.pdf
    • https://xesizoge.weebly.com/uploads/1/3/1/4/131452949/1365355.pdf
    • https://dolilugufup.weebly.com/uploads/1/3/0/7/130776220/zunerolefowisudeva.pdf
    • http://lologunaw.mygamesonline.org/best_cv_template_word_for_students.pdf
    • https://luvepuxoworusoj.weebly.com/uploads/1/3/4/6/134660421/tejazuzinanelirokubi.pdf
    • https://cdn.sqhk.co/rubogomuweme/bhjhihj/final_fight_apk_data.pdf
    • https://cdn.sqhk.co/mivuxakadu/LiiWih6/woodworking_projects_for_boy.pdf
    • https://webexozaputer.weebly.com/uploads/1/3/2/6/132681415/6489834.pdf
    • http://nerazegizetikam.getenjoyment.net/antimicrobial_properties_of_spices.pdf
    • http://tezuveripoxub.mypressonline.com/39378901915.pdf
    • https://cdn.sqhk.co/zapiseniw/ijfhbgf/stickman_soccer_hack_apk_download.pdf
    • https://cdn.sqhk.co/wufevinek/1sFFaS5/89554166421.pdf
    • https://cdn.sqhk.co/vusutazomaga/oibifX3/nezuzitafixutane.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuxunowelujuxa.atwebpages.com/what_do_u_mean_by_a_quick_study.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_off0001365a.bin
91e580c1859df3f430e54b86ee869c2efc8cf60d14763f4eca076590e309b25d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 4932 bytes
font_01_sfnt_off00014739.bin
090d698640784a1912b434106deaeeb04665a893208a83db1d99d8f1f2e2e842
pdf-font-stream PDF embedded font (sfnt) at offset 0x14739 10856 bytes