Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bd2d7257a26fc8…

MALICIOUS

PDF

79.2 KB Created: 2021-03-14 15:13:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60962a6c94ae8e33d85caf87cb2be125 SHA-1: 48f0bf982c0dd12421f02eee01681def61e3a84d SHA-256: f1bd2d7257a26fc81bd72aa7c895d3a97dbbdacd9e061dc6aadffee5ab88f304
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 of which are SEO-optimized and point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious. The embedded URLs suggest a phishing or malware distribution scheme, likely attempting to trick users into downloading further malicious content or submitting sensitive information.

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://botokaw.ru/award?keyword=calculus+by+howard+anton+11th+edition+pdf
    • https://cdn.sqhk.co/kawinojos/d2XLieP/canada_post_international_shipping_customs_form.pdf
    • https://cdn.sqhk.co/noruwotil/hehijhl/91631833846.pdf
    • https://cdn.sqhk.co/ruxuzobisu/CRijJ6G/gomo_apn_philippines.pdf
    • https://kimuremosov.weebly.com/uploads/1/3/4/7/134732255/puvoropojes_nodexekizerar_sezisu.pdf
    • https://cdn.sqhk.co/vovewotutal/gfrXiga/fake_call_for_bendy_app.pdf
    • https://cdn.sqhk.co/bixatavafut/WqUAhh1/xipesikevosatotepigafak.pdf
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/7588821.pdf
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/3146089.pdf
    • https://cdn.sqhk.co/wirujurumugi/kLAigii/76682102338.pdf
    • https://wakavofidokevi.weebly.com/uploads/1/3/2/6/132681750/sorimedam-fotadabozadure-pobeze-jewumitowa.pdf
    • https://cdn.sqhk.co/puvegipuros/c1uhfhj/kexovaz.pdf
    • https://cdn.sqhk.co/badaxiloru/ajf5i4Y/froggy_bounce_house_fountain_valley.pdf
    • https://cdn.sqhk.co/jawutuwek/fPiJWhc/business_days_calendar_usa.pdf
    • https://vobikonim.weebly.com/uploads/1/3/5/3/135390296/jovelizugetimutatizo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e40da922-b0e4-44be-9878-2d4898ccab21.filesusr.com/ugd/3a38e0_7a4276be59984de0861e82fac8e38e10.pdf?index=true
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_dc9fbb9924a84ef28b9ace798047e45a.pdf?index=true
    • http://vigexosav.myartsonline.com/schneider_ats01n222qn.pdf
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_d897dfafbf4b440f98b59115d2ec2800.pdf?index=true
    • http://wadoromutisagar.myartsonline.com/surah_mulk_mishary_rashid_alafasy.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_off0000f59c.bin
adcf268a3d17f517486d2dc78df27254471b6f44af3cd5ccce7788fd9392f6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 5536 bytes
font_01_sfnt_off0001087a.bin
fe3fe588cf0a014bcec3db58580cca65ec4b31b03f4da2a794074203c242d549		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087A 11592 bytes

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