Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7833e8a919078f…

MALICIOUS

PDF

146.1 KB Created: 2021-05-06 08:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 96c0edd4c9b7de01435dab0caaab998f SHA-1: 687cffbe21d947049cead963ff32632e95357a55 SHA-256: 7c7833e8a919078fb6e7a68022e9dc09b586d01b0d09d9f7817141e271d385bf
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jottigo.ru/strik?utm_term=diferentes+tipos+de+establecimientos+de+alimentos+y+bebidas PDF link annotation
    • https://nivuzodix.weebly.com/uploads/1/3/1/4/131410872/kagoxapedelep_wabipa_sabeza_lejetibuzosejo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458621/normal_60282474a2ec7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368477/normal_5feff91b24a9a.pdfIn PDF document text
    • https://rovepegolotiru.weebly.com/uploads/1/3/4/3/134319415/c1ff7a4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369648/normal_600a2369803e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482219/normal_603ebbb871e43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_60127ade8654d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485572/normal_6008e0d641063.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415767/normal_6035a575482bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_605f6b4702eef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_60516f7ca7c2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kowotasube.epizy.com/rinaludagaf.pdfIn PDF document text
    • http://visinoburugebug.epizy.com/assam_high_school_tet_guide_book.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_c90397c489ec4e8dadbd8ba0348bb3e3.pdf?index=trueIn PDF document text
    • http://dibimagawedifik.epizy.com/tirutofoxulorapuwipan.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/kudesesipujo.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/define_catastrophism_and_uniformitarianism.pdfIn PDF document text
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_c8abbc075132499195bcce6d2f28e1ec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujanozo/54033596797.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_455939578bce4d7cbf87937bd5cd9696.pdf?index=trueIn PDF document text
    • https://0ef2f354-78a3-4528-990c-72f69c86fc6a.filesusr.com/ugd/6a0da6_8d2654bb7cda44f6aec90a0e37428d04.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/oxford_english_dictionary_history_of_words.pdfIn PDF document text
    • http://tipisekoj.epizy.com/rinivegazomanifokolumu.pdfIn PDF document text
    • http://togotavasokuzez.epizy.com/chuyn_t_file_sang_hnh_nh.pdfIn PDF document text
    • https://5b3500e9-40b4-440a-9ada-171ed8bcf4c9.filesusr.com/ugd/7820d0_9948bbeaf3694cf3984c5486b36aed38.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E99F 5540 bytes
SHA-256: c371c925e6827ad1ef297fc9ffbd5442d456a77f57a09ce253574e0b6433fcfc
font_01_sfnt_off0001fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC6E 11384 bytes
SHA-256: 88745f73b8710d532833027e383e41dda074c2dc4568d86464abba9b8b293118
font_02_sfnt_off00022323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22323 16060 bytes
SHA-256: d1a84ba8f0e4a827a048d387db8dd5dae3538f1c7e72415b16af587a9947cdc7