Malicious PDF — malware analysis report

Static analysis result for SHA-256 c310ad190e06798c…

MALICIOUS

PDF

79.7 KB Created: 2021-03-23 02:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 642a727823048b1afb8aad568b5f1f04 SHA-1: 2e1318b3aeee41b620d1d3c621efa7ac233f5385 SHA-256: c310ad190e06798c38fb9b5c01c5d4f7360b4a8c6b6b9445fae9be21f0b4726f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content, possibly for credential harvesting or malware delivery.

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://nipisod.ru/strik?utm_term=eyelash+extension+training+course+near+me PDF link annotation
    • http://vebofituzor.iblogger.org/83521808995.pdfIn PDF document text
    • https://wuxinaruniluxod.weebly.com/uploads/1/3/4/8/134882591/zozugorifipovisuk.pdfIn PDF document text
    • http://jidugisukeranav.iblogger.org/wewamiguzikawapekexasulij.pdfIn PDF document text
    • http://memijijarem.22web.org/agile_epic_story_template.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/wasokigubigunujemif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417128/normal_5ff0458e3f265.pdfIn PDF document text
    • https://bofisolipog.weebly.com/uploads/1/3/4/4/134438855/1311223240.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/7497844.pdfIn PDF document text
    • https://misadedami.weebly.com/uploads/1/3/3/9/133997414/bumutejosadosotabof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_5fcce9e1233b0.pdfIn PDF document text
    • http://nixiziloge.iblogger.org/acido_hipocloroso_formulacion_quimica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bejutamukedus.epizy.com/chess_tempo_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b9e06d9-6bc9-41ff-81c4-ebe6f45c4818/whats_another_synonym_for_violent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f89ec566-6d67-4af1-ba8a-ccfb51595a90/25999253869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e837258-da69-42cb-844b-3586753ff20e/what_is_a_system_engineering_model.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a671ea70-948a-4057-8a97-75bb3437ccf3/verb_tenses_list.pdfIn PDF document text
    • http://zotibulavozixu.rf.gd/create_data_entry_sheet_in_excel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0327e255-fb22-4df7-a7d3-8b4b7f863a6c/luwifagob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13abd516-6f70-4327-8ce0-20e1fe140d22/13689422038.pdfIn PDF document text
    • http://wubijati.epizy.com/why_do_new_guitar_strings_sound_better.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF5 5220 bytes
SHA-256: b628ba7109030a3d213afb9dc4f2636d09f91e90704775afa53c837554458700
font_01_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 10620 bytes
SHA-256: a58e486a996ae85e4275040ae901b90c2fe631c9b4cc90b01ccdd88425f4ad08
font_02_sfnt_off000120c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176