Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc0eb37f2003128…

MALICIOUS

PDF

94.8 KB Created: 2021-05-09 22:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d44ff09d3a65335b5419fb6724132b37 SHA-1: 7d03227daec5034399c3676ef1ade814dacb2b5b SHA-256: fbc0eb37f2003128b7a88f97b3f9c0fd03ff9ac903349f4e374a7fab6dee58ef
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with a primary suspicious URL being https://nipisod.ru/strik. The document body, though heavily obfuscated, appears to be a lure related to 'Adventures of Tom Sawyer' to entice users to click the malicious link. No scripts were extracted, but the PDF structure and URL patterns suggest a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://nipisod.ru/strik?utm_term=adventures+of+tom+sawyer+summary+chapters+8+to+14 PDF link annotation
    • https://vapomawuwe.weebly.com/uploads/1/3/1/3/131398268/f35f2392a068.pdfIn PDF document text
    • http://tozidak.mygamesonline.org/the_courage_to_be_disliked_drive.pdfIn PDF document text
    • http://mrshadow.net/niv_study_bible_onlineernpa.pdfIn PDF document text
    • http://3203epworthcres.com/honda_hs828_snowblower_partsx6mh5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450240/normal_601f81d3d5e0e.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/77355481492.pdfIn PDF document text
    • http://aicberg.net/legends_of_runeterra_card_template8k8r3.pdfIn PDF document text
    • http://futajef.medianewsonline.com/wavovorivumobidebajigo.pdfIn PDF document text
    • http://getcreditreport.info/karcher_user_manualxbfav.pdfIn PDF document text
    • http://creditscoretracking.info/11540747521xfrcn.pdfIn PDF document text
    • http://matcobzor.ru/namco_pac_man_connect_plug-and-play_tv_video_gamem99wf.pdfIn PDF document text
    • http://supermagazforsale1.xyz/46194574197s77rc.pdfIn PDF document text
    • http://guitar.su/kometuluvojexiptck3.pdfIn PDF document text
    • http://centerverifybadge.com/vadibakoxudugivuxogawmpi.pdfIn PDF document text
    • https://lanutitokoxoziv.weebly.com/uploads/1/3/4/0/134096970/c8f95f774d8cda6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415974/normal_603727e58da90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421627/normal_603e8f2707525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468837/normal_6018e43e19a8f.pdfIn PDF document text
    • http://superheatbelt.xyz/cut_the_rope_2_mod_apk_free_downloadea1ef.pdfIn PDF document text
    • https://wujuwali.weebly.com/uploads/1/3/5/3/135326068/lagevemojavidaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc8b8232-7547-4bb9-af98-72e0e28cd1cd/lexaketukomobepomomeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d336dced-4e9c-4e12-a14c-556682c233d9/wenadi.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_off00012cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBD 5940 bytes
SHA-256: ca0edf993ec6b9666ad3b480ebb18c853ad2813611393c26c8cb95c68fb1aa4b
font_01_sfnt_off000140f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F8 14124 bytes
SHA-256: 74f8488810ba41b1f1158af5f84cd2c4adb5c3210b8ef6a45b470e7df5282361

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