Malicious PDF — malware analysis report

Static analysis result for SHA-256 d39a0967a4a1ecaf…

MALICIOUS

PDF

71.4 KB Created: 2021-04-27 04:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: fe49a48ffef7b458a74589e2a57abc62 SHA-1: e91665b9c6c223c65abe66e42824ea507fbdf36b SHA-256: d39a0967a4a1ecafe8ac0783cac098c18d84bcd5383355ab7143098eec3a3ec6
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious content.

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://leonvi.ru/strik?utm_term=que+es+orar+en+el+espiritu+armando+alducin PDF link annotation
    • https://vutavapurazamo.weebly.com/uploads/1/3/4/6/134643269/8057740.pdfIn PDF document text
    • https://lakiregatu.weebly.com/uploads/1/3/4/5/134589313/fotejo.pdfIn PDF document text
    • https://mogiwivimar.weebly.com/uploads/1/3/4/7/134731652/tuxutuve_zuvezixozo_kugomikenalibe.pdfIn PDF document text
    • https://fejufawos.weebly.com/uploads/1/3/4/3/134328201/suwozilavonaxax.pdfIn PDF document text
    • https://funoridarudaru.weebly.com/uploads/1/3/5/3/135304061/nowaganenazovaz_nimanetezatu_sopudekigenos.pdfIn PDF document text
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/zuzixerovuxoriru.pdfIn PDF document text
    • https://judozonax.weebly.com/uploads/1/3/1/4/131454501/narojo.pdfIn PDF document text
    • http://cherrypimp.online/flip_jump_stack_apk_mod712bw.pdfIn PDF document text
    • http://momentikshop.space/ossified_ligamentum_flavum_case_report38r8l.pdfIn PDF document text
    • https://jenodavosu.weebly.com/uploads/1/3/0/7/130775827/2beb9e932120a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_f7fd2c60b26a49578faf1b58499b429a.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_112ffde0d2084fd591e4d51f4424610f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7470b486-7038-40c0-a162-c8cba048fefd/58500852278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9d4035e-4dac-4d33-82d9-233f200185cc/how_to_use_apple_cider_vinegar_to_brush_teeth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a8798a6-2586-455e-8dbf-b8a1a8031653/what_books_are_like_diary_of_a_wimpy_kid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22453bb1-8cb6-49b4-b069-53eab4b90766/cfop_method_pll.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ea05d1-860c-4545-8a81-bc09e97f6dfa/40891487696.pdfIn PDF document text
    • http://vegazomu.epizy.com/19694039110.pdfIn PDF document text
    • https://4da44922-6ee1-4515-aed7-54c3d6b51f77.filesusr.com/ugd/243a28_b7f671d9ef7242a4b9618da883f2ce64.pdf?index=trueIn PDF document text
    • http://xedovafimolodem.epizy.com/anybody_can_dance_2_all_song.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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 5280 bytes
SHA-256: a4ccd70368038b8012f5b5bbfe6f41008f2da352f042fe3c934a1767a8d75487
font_01_sfnt_off0000e9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BA 11860 bytes
SHA-256: 9a30c2c5d1817ccfd7f10efe18c9a3c78b03a86884948473473562045cd97b00