Malicious PDF — malware analysis report

Static analysis result for SHA-256 83c9ccf6bcc070fd…

MALICIOUS

PDF

76.7 KB Created: 2021-05-17 20:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 97818b07765cfb960952b0db5c8d0bbe SHA-1: a9fbfa58d64aad92b7f71570d4403cb5dc332497 SHA-256: 83c9ccf6bcc070fde170ebfa504be417a444ed2500969044c40e351597031930
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://lozipotod.ru/strik?utm_term=5+love+languages+for+apology PDF link annotation
    • http://kizunawinim.getenjoyment.net/attack_on_titan_season_1_theme_song_ringtone.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/negod.pdfIn PDF document text
    • http://jawazapefaxuzit.mywebcommunity.org/risuxek.pdfIn PDF document text
    • http://sidazolomaw.22web.org/xkit_physical_science_grade_12.pdfIn PDF document text
    • http://nuwojukow.mygamesonline.org/26555266115.pdfIn PDF document text
    • http://joxitikoki.getenjoyment.net/92213029459.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zijivevip/shatter_me_book_4_summary.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/90210299246.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/early_names_test.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/news_report_intro_video.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_2cf71531fda34ed0b13e34fde4e02f1d.pdf?index=trueIn PDF document text
    • http://rivadejupogutun.epizy.com/sparkfun_load_cell_amplifier_datasheet.pdfIn PDF document text
    • http://wasokutuv.epizy.com/guxixidanemikotokak.pdfIn PDF document text
    • http://papopelavul.epizy.com/pufowore.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_4b697f4b30d542ecb2ba32f570d20664.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/bunnings_sliding_door_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/mutizefu.pdfIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_74acff1cda054206a95a2ed07cb73949.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bagokiko/9967840052.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_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 5260 bytes
SHA-256: 7b60fe9f326e09981c22a5749deb9cc9ff497e7765199288679bc4e5e64a306c
font_01_sfnt_off0001010c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010C 10916 bytes
SHA-256: d4d4f5a4e675c5f489b352474bef24617d38eee45ed45e3c6637de01b445bbe2

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