Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5c6d132a05ea762…

MALICIOUS

PDF

88.3 KB Created: 2021-04-01 01:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: b8a69b8ee44befb020526ac7a36392a7 SHA-1: 2f91bf22ba84d8239f5140683dc578d25facae8a SHA-256: b5c6d132a05ea76225d235fb6d4135092209e15daa63c91970ffc95042f3a988
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/strik?utm_term=administracion+de+medicamentos+via+intravenosa+fundamento PDF link annotation
    • https://cdn.sqhk.co/baluwofuk/JhhQ59z/steam_download_speed_cap.pdfIn PDF document text
    • https://supavutoni.weebly.com/uploads/1/3/4/7/134713891/xopamopedikusa.pdfIn PDF document text
    • https://tomasuniraruz.weebly.com/uploads/1/3/5/3/135392941/6195781.pdfIn PDF document text
    • http://kafujaguvo.mygamesonline.org/56180423969.pdfIn PDF document text
    • https://mavukaral.weebly.com/uploads/1/3/4/9/134904766/6487583.pdfIn PDF document text
    • http://gazzsheff.xyz/symbolism_in_literaturewxz6y.pdfIn PDF document text
    • https://xukoperupe.weebly.com/uploads/1/3/4/7/134743664/2042851.pdfIn PDF document text
    • https://boteroxelanivif.weebly.com/uploads/1/3/4/6/134698142/sovewakegafezaxeku.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/caminhao_betoneira_senai.pdfIn PDF document text
    • https://rujunile.weebly.com/uploads/1/3/2/7/132710621/8804239.pdfIn PDF document text
    • http://save50.pro/carnatic_music_book_in_english7n9fg.pdfIn PDF document text
    • http://testvvd.xyz/how_to_reply_an_appreciation_email_from_boss1lwh4.pdfIn PDF document text
    • https://cdn.sqhk.co/lopovekis/hhghbhe/automatic_dog_ball_thrower_uk.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/d70be1a7-4a7c-44fe-bb89-32ec848cd6bc/ncert_class_6_english_book_with_solution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fb6736f-38ca-49cb-8c4d-5ed117002862/percy_jackson_and_the_battle_of_the_labyrinth_chapter_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce82198-5e4a-45e2-8367-bb3459408607/collapse_when_buildings_fall_down.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71af3355-dd2e-4fdb-a2b5-3f6b017f28b6/77268469091.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_off0001190b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190B 5184 bytes
SHA-256: b627942c9864309b0da27f199798aae1c05be31221a5a932b04d2633e2079324
font_01_sfnt_off00012a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 12752 bytes
SHA-256: 282b57867e30535f0bd36cf3f5af1b51d09a9cc27772c165be5680b3137dbe66

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