Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ebbeac23361d7a…

MALICIOUS

PDF

92.9 KB Created: 2021-04-02 17:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7e562c3eabc8bb9e8653f3cda75ef4df SHA-1: 4cded576ca72a2e57b46779b57da8881b7e986d5 SHA-256: 90ebbeac23361d7a532365d66c4ed7ea5838f7b16cde5439082e2f75446b09ea
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded external links, identified as a link farm. Several of these links point to disposable hosting services, suggesting an attempt to obscure the ultimate destination or to distribute payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the link farm itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/123?utm_term=protists+and+fungi+worksheet PDF link annotation
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/6433997.pdfIn PDF document text
    • http://1cats.space/mubovitezunagopapufariljx2n.pdfIn PDF document text
    • https://tewedarutomos.weebly.com/uploads/1/3/2/3/132302993/781449.pdfIn PDF document text
    • https://pitatulepuz.weebly.com/uploads/1/3/2/3/132303378/xepirodemapojuf.pdfIn PDF document text
    • https://wulafuxuzezam.weebly.com/uploads/1/3/2/3/132302924/kakabo.pdfIn PDF document text
    • http://znakomstva18x.site/best_dog_food_for_alkaline_urine2vwnc.pdfIn PDF document text
    • http://dkblogin-de.com/45275352720o8vw.pdfIn PDF document text
    • https://zojipulororasa.weebly.com/uploads/1/3/6/0/136011419/pijozixosiluzapi.pdfIn PDF document text
    • https://kutemipemowu.weebly.com/uploads/1/3/4/8/134860595/b040826d305520.pdfIn PDF document text
    • https://ketezujozak.weebly.com/uploads/1/3/4/7/134744557/todejewaw.pdfIn PDF document text
    • https://namowabe.weebly.com/uploads/1/3/4/0/134000139/vakesifulit.pdfIn PDF document text
    • https://garujidizog.weebly.com/uploads/1/3/1/3/131398488/nezosetuwibofik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_b7f12715bce34cdab358e43bf0a7aeea.pdf?index=trueIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_e5818f282c704edcab51bac58a7e923d.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_c9b2722692b449c7afd362f99ed3e803.pdf?index=trueIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_32ebfd79a43b443c96d9421716c127c0.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_64a38f5f780049f6b9c60bc160ca1dba.pdf?index=trueIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_7926839f8a1b4fdaaa4ef57874666e38.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off00011600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11600 5292 bytes
SHA-256: 746f485c2ce71ae23259c2070c9c1ebf1b57a638617b19744c2b757a709c8ed6
font_02_sfnt_off00012812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12812 11988 bytes
SHA-256: 47a7731c144c65cc88974677af6cd23a2a42f0a34b02712069cf91113f3cca14
font_03_sfnt_off000150de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DE 16096 bytes
SHA-256: 4936cfea8caa47560990797cd2c4c6221db66ff6d6108450f6bfbefc465c3cb4

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