Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fa46070a2bdd35…

MALICIOUS

PDF

77.2 KB Created: 2021-05-01 17:00:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7cf17604938a72a376e696794ee13145 SHA-1: afcd6e9e295f72aaea468ebf34c0c32f76b290bb SHA-256: 97fa46070a2bdd35b524f780440eb1aaefb110d81af8a3d53cf032418b036277
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://vilenefex.ru/strik?utm_term=how+to+administer+the+fugl-meyer+assessment PDF link annotation
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/7029878.pdfIn PDF document text
    • https://wixevilit.weebly.com/uploads/1/3/4/8/134873569/2422896.pdfIn PDF document text
    • https://lalojitewimagix.weebly.com/uploads/1/3/5/3/135304200/13ff55b8a.pdfIn PDF document text
    • https://moxamegok.weebly.com/uploads/1/3/3/9/133999551/babitajin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rirusozo/lirojukisojerebonofona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c4c73d-eeb5-4ea8-a6d0-9ca8c1431f9d/96348612208.pdfIn PDF document text
    • https://fd0ef26f-7b8f-4c91-b3b2-19f7ec93487a.filesusr.com/ugd/4174bf_60dc98893dcd4ba8a4c0e5161ee2af12.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_43fb72d1178a4ce28ff74cf956ec5296.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5deb45a-ffae-4295-a02b-e20763d28d40/what_is_army_reentry_code_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e178f03f-da93-4433-b3c9-35a5a0c3ea5f/primer_curso_de_contabilidad_elias_lara_flores_precio_descargar_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f3b2e9-505d-4054-b354-aaa6104bde5e/casio_wk-110_usb_midi_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c04235-76a3-49c8-9ba7-ce99e844aeec/how_to_draw_a_dog_easy_realistic.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_8351a6a42932483db0e03d412a1aeaba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/3999869348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5350e465-bd18-4978-bdd4-af9229119074/analytical_essay_example_college.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b76ff56-d14f-41f7-aa75-ded9339f539b/books_like_a_woman_in_berlin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/489fbda0-314b-49bd-ad55-d64a21ed4bc9/butter_lettuce_calories_1_cup.pdfIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_d99dfb63decb4de5b4d6994db2a9133a.pdf?index=trueIn PDF document text
    • https://84bd2c60-91d0-47b6-9565-6ae8a6593e58.filesusr.com/ugd/963627_c71599a5f423449d954e4e727ff3a956.pdf?index=trueIn PDF document text
    • https://63c031ef-a76e-4574-b6c7-b683c5cdde0f.filesusr.com/ugd/3a5e7a_8225c469eabf4968874798bad87ee529.pdf?index=trueIn PDF document text
    • https://doi.org/10In 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_off0000ee7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7F 5508 bytes
SHA-256: 058dfe7ecf6639a6164ad72b310ef116a0a052e50f19e38cf0a4812857d4677d
font_01_sfnt_off00010132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10132 11212 bytes
SHA-256: 1d4a06cb28f684a306c736667f860d9eac1e3a00ed1e465b31d0cc90d1a0c05a