Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2c2026c32d2b20…

MALICIOUS

PDF

85.0 KB Created: 2021-03-23 11:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: baff38f53ae247deaae02217117680bf SHA-1: a78eaa0b6fe9dc90d84a3898be0d66877f7a3826 SHA-256: cb2c2026c32d2b205f97ee2c17ff400e0ac1a6b6c956fe8c4ba70065bb566977
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to deliver malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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/123?utm_term=catalogo+de+cuentas+pdf+completo PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369933/normal_5fdf01dfcd91d.pdfIn PDF document text
    • https://razovifizekojo.weebly.com/uploads/1/3/4/4/134439397/5452582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377925/normal_5fe244fc33891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_6013bbff78077.pdfIn PDF document text
    • https://zezojafoxivofed.weebly.com/uploads/1/3/4/5/134528913/9369009aac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382407/normal_5ffbc4561cc54.pdfIn PDF document text
    • http://dokuloraxu.22web.org/kukavukirogezabisewori.pdfIn PDF document text
    • https://guratebiliwabop.weebly.com/uploads/1/3/2/6/132682790/waxov_lasiwojen_vuxujapabelofu.pdfIn PDF document text
    • http://tonozezoziw.iblogger.org/aver_information_inc._fremont_ca_94539.pdfIn PDF document text
    • http://domsale.xyz/online_spoken_english_booksf98if.pdfIn PDF document text
    • https://nalokulomegeze.weebly.com/uploads/1/3/4/7/134758193/luxajejenuzija.pdfIn PDF document text
    • https://jegupifak.weebly.com/uploads/1/3/4/0/134018348/1474671.pdfIn PDF document text
    • http://rexapeduke.66ghz.com/16667643510.pdfIn PDF document text
    • http://idealslimitalia-official.site/breakup_shayari_photo9fvfg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380681/normal_60596f53d6905.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://kulegekagaxi.epizy.com/how_to_use_printable_heat_transfer_vinyl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f31f58d4-1c91-4e97-bc22-c2a086ad01b3/why_is_my_jeep_not_shifting.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/26168501840.pdfIn PDF document text
    • http://levowemorunob.epizy.com/28604518138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eab5786-0091-4768-ac2a-ec233696e921/89677747662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2feed908-7bec-49a7-b119-9ad82acda96e/how_to_train_your_dragon_book_1_chapter_5.pdfIn PDF document text
    • http://lunujebof.rf.gd/pre_engineered_buildings_design.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a142fc7d-444a-4c68-9cd0-a1ef8ec44374/2001_ford_windstar_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a289ef5b-b8d8-4998-b5bd-035ddfe409a4/what_is_fox_news_doing_now.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_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 5236 bytes
SHA-256: cf07e81ac11fce2885f725f07adbf23ebebb24531864c6fcae5c42f45fea2a32
font_01_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 11460 bytes
SHA-256: 451555bb2e1528bbae539f1abbe2a25d690c8560b32ee90064efe272f7889f8e
font_02_sfnt_off0001364b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1364B 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c