Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b053b9006a041a…

MALICIOUS

PDF

64.5 KB Created: 2021-02-16 21:25:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5a96d755c8416fcfbfba1b79383eaf92 SHA-1: acb7b12aeddfa7ee6e2ac7f84e1d9eb9e6711366 SHA-256: f5b053b9006a041a8ef0de2195962ce0ec931c32df687fa10117afa204a0e473
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The document body, though heavily obfuscated, contains text related to 'Thomas calculus 12th edition solution manual pdf chapter 1', indicating a lure to attract clicks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/123?utm_term=thomas+calculus+12th+edition+solution+manual+pdf+chapter+1 PDF link annotation
    • https://febamepu.weebly.com/uploads/1/3/1/0/131070604/2488597.pdfIn PDF document text
    • https://xobuwepowitapim.weebly.com/uploads/1/3/0/7/130775805/1cee3ccfa.pdfIn PDF document text
    • https://rusipamisu.weebly.com/uploads/1/3/4/0/134017355/37777b509.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/dEla0R2/apple_airpods_pro_boxing_day_sale.pdfIn PDF document text
    • http://ita-bio.space/gelapewumutegezujijemuv7q2u1.pdfIn PDF document text
    • https://xidelesa.weebly.com/uploads/1/3/4/4/134498911/dusetigisigijitat.pdfIn PDF document text
    • https://cdn.sqhk.co/ridasozewe/O3SjbzR/best_buy_keyboard_piano_black_friday.pdfIn PDF document text
    • https://livaganomin.weebly.com/uploads/1/3/4/3/134399079/1869184.pdfIn PDF document text
    • https://domilejoxu.weebly.com/uploads/1/3/4/5/134529458/9532241.pdfIn PDF document text
    • http://paypallsecurity.com/rustoleum_cabinet_transformations_top_coat_yellowingm7bv2.pdfIn PDF document text
    • https://wekosidofanepa.weebly.com/uploads/1/3/2/6/132696212/6686423.pdfIn PDF document text
    • https://cdn.sqhk.co/veludewozen/cMibFje/galaxy_s20_ultra_ringtones.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/cFEjds3/pokokiwoxezofadule.pdfIn PDF document text
    • http://car-test.pro/punjabi_movies_list_2019wnlmy.pdfIn PDF document text
    • https://komamezumef.weebly.com/uploads/1/3/1/3/131398541/dedeze.pdfIn PDF document text
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/lebudirepime-favaramemepude-bapawuxak.pdfIn PDF document text
    • http://usersdeviceprotectionservice.site/graveyard_keeper_la_tinta_y_la_plumachlh2.pdfIn PDF document text
    • http://getliterate.online/cover_letter_template_for_nursing_studenti4ctt.pdfIn PDF document text
    • http://sluzhba1.net/android_studio_emulator_5554_offlinebrydf.pdfIn PDF document text
    • http://naturmilans.fun/95332016399h9zrz.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/voguzakim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000be91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE91 5528 bytes
SHA-256: e8abc45780d9c46bbe22b74fb795116bf45d0c91bbd5d29cf861edc2c4b9234d
font_01_sfnt_off0000d139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD139 10200 bytes
SHA-256: 88fb8ebe6423fcbb8470b1c5ec097b6bef17364683f3f96d4dcbc8463ae094a7

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