Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb8f2ace4dfb2fa…

MALICIOUS

PDF

75.1 KB Created: 2021-03-29 05:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: eb06fa97e8831c8107926bcd12418b0b SHA-1: 7e9aae1611092b4d630689e01ff49bcf1a80c30e SHA-256: 5fb8f2ace4dfb2faf774ff70f49edb4c19ff9d306a5d7caf2843e5eb7a2e2f11
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host or link to other malicious resources.

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://resalured.ru/wix?keyword=citizen+u600+manuale+italiano PDF link annotation
    • http://bcpzonasegura10beta-viabcp.com/what_is_the_phone_number_for_the_national_human_trafficking_hotlineq6m9c.pdfIn PDF document text
    • http://help-igcopyright.xyz/cool_icon_pack3lexy.pdfIn PDF document text
    • https://cdn.sqhk.co/tedubifo/jdgjOed/66212289175.pdfIn PDF document text
    • https://xegejigavo.weebly.com/uploads/1/3/4/8/134883842/nirinaxugofere.pdfIn PDF document text
    • http://kewatupu.scienceontheweb.net/how_to_hack_a_dvr_password.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/ifheJwS/open_laptop_camera_dell.pdfIn PDF document text
    • http://zedakobogesa.mypressonline.com/31045654409.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/batunixezerutubikan.pdfIn PDF document text
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/fulito-moromub-ketilodor.pdfIn PDF document text
    • https://cdn.sqhk.co/rarukaboz/41AwLgc/72826815185.pdfIn PDF document text
    • https://cdn.sqhk.co/muluxodipoto/hB4gdcK/college_basketball_coaches_poll.pdfIn PDF document text
    • http://retamos.mygamesonline.org/programa_para_calcular_integrales_definidas_online.pdfIn PDF document text
    • https://joguwezur.weebly.com/uploads/1/3/4/5/134500750/8cbd7eb48.pdfIn PDF document text
    • https://cdn.sqhk.co/budajawisore/VUhjhjJ/fotefopalaw.pdfIn PDF document text
    • http://meetsalle.xyz/doxozunafakixegapasebotefomq8.pdfIn PDF document text
    • https://cdn.sqhk.co/mutuwatu/rnQ5ied/hide_and_seek_vocaloid_japanese_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/gdB5vgc/heart_3d_puzzle.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_5052f957e57b4338a34d033579efeebe.pdf?index=trueIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_00c6fb2497dd4b2a85314341e59e1c74.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_6892985d5ebe44e1b526add8c5b51226.pdf?index=trueIn PDF document text
    • https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_263506a6785646a3ae30a18414c6a075.pdf?index=trueIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_13105c98d17f4030bc3d92df484376e8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 4808 bytes
SHA-256: dfc84b78dec3a6fae5479160ede4a523824aa51f972c5f8f04a71b64c1b2259d
font_01_sfnt_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 12840 bytes
SHA-256: b705ba9590af65ff4c0ccc3f3e7327ad64344e989a2ca779c354214f0f6987be