Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e91dbceb9c2710e…

MALICIOUS

PDF

72.9 KB Created: 2021-03-14 15:05:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b8c1cf41006fbefa4e0d535a2d96acd7 SHA-1: 94ef19683549def55e1ea911874eb4a54990ea38 SHA-256: 8e91dbceb9c2710eb85c730860f1f87c9e02adc36b33d570be804a94e11c9edf
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-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://xajibur.ru/wix?keyword=how+to+get+free+nanas+on+appnana+2020 PDF link annotation
    • https://rerutafedebe.weebly.com/uploads/1/3/2/8/132815298/236796.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/hbihJhc/bapalomolofegogikejivanim.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/roderotinosejoloxigajazu1qtev.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetovukufo/dmFojRt/671410437.pdfIn PDF document text
    • https://cdn.sqhk.co/kozosorole/jgjcDjn/crash_course_python_programming.pdfIn PDF document text
    • https://cdn.sqhk.co/tupuvojili/bvhhhfm/patiwubakavofiwato.pdfIn PDF document text
    • http://revershjtb.site/search_google_with_image_instead_of_texto9nim.pdfIn PDF document text
    • http://opit.space/35520435425gi9zp.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/gAjcMie/tevogatataku.pdfIn PDF document text
    • https://tizidebiwefixim.weebly.com/uploads/1/3/0/7/130739379/856eeaab031453.pdfIn PDF document text
    • https://cdn.sqhk.co/sifujubagis/hfGage6/canada_food_guide_old_vs_new.pdfIn PDF document text
    • http://extraterrestrials.space/vulosebiviv0yes.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/hdhigdE/survival_island_full_movie_720p_free_download.pdfIn PDF document text
    • https://dimalosuzilem.weebly.com/uploads/1/3/1/4/131452887/kipibibebaleg.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/dAiigja/21215031607.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/topology_munkres_solution_section_272ohm4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_b2803d31b5e545ecb83e87ff667cf430.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_b0f963a9243a4c3ab28a5c2a39f1ccf3.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_bbaa540d92584af0af6bbf29839f0d72.pdf?index=trueIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_991dce8e65744eaf8dc725bad2880ac9.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F7 5364 bytes
SHA-256: db82795fb135c71984c4cb86f434385722ab87553fcb0c20dd370eebcb0737df
font_01_sfnt_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 2092 bytes
SHA-256: 78e94e2e47178245ca437e301e19f50dc99845ecc02da2ba30fe2b1e34051cc2
font_02_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 10612 bytes
SHA-256: 208849aa131756071d85a330162f9fa45f7840e12ead55e7a2922a5fc00eb917

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