Malicious PDF — malware analysis report

Static analysis result for SHA-256 a758978b7502076b…

MALICIOUS

PDF

73.2 KB Created: 2021-01-28 11:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3aa40d36217081bdbd00c1789495bd9e SHA-1: d23910ff4534c7f264ef3fa8747917876cffcf81 SHA-256: a758978b7502076b24449d8d506b542ec5fb02afbf98ee8a9016d81e2cf57de6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm designed to redirect users. The primary URL, 'https://leonvi.ru/123?utm_term=ffxiv+6001+error', suggests a lure related to a technical error, likely to trick users into visiting a malicious site. ClamAV detection and ML classification strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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=ffxiv+6001+error PDF link annotation
    • https://cdn.sqhk.co/mopewedote/fibRSjd/lokuwipaxupopovagobusev.pdfIn PDF document text
    • http://nizagose.66ghz.com/single_bed_sheet_cover_size.pdfIn PDF document text
    • http://ranking-se.com/real_racing_3_hack_mod_apk_download7c01d.pdfIn PDF document text
    • http://alifan.store/al_quran_malayalam_malabar_translation_mp3obogs.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvidomanale/jNDjbgg/5550890251.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/TjciaU6/92527876473.pdfIn PDF document text
    • http://taher-tcac.com/nuzemuxajopogoxurokx5kr1.pdfIn PDF document text
    • http://piredvizhnik.com/mitidejolegukewosqqdt.pdfIn PDF document text
    • http://infonewstravel.com/mofirizawenif4o5f.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://nalosig.rf.gd/4th_grade_saxon_math_book_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/32581695823.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/acceptable_forms_of_id_nsw.pdfIn PDF document text
    • http://welavosapo.rf.gd/formal_and_informal_language_worksheets_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/24867280525.pdfIn PDF document text
    • http://gojejamajutemus.epizy.com/legendary_game_of_heroes_catalyst_guide.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC807 3876 bytes
SHA-256: a7b0e498aa1320aa357fb13ecf08953c8b8fd31986fa061b8682b12ec846aedb
font_01_sfnt_off0000d5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CD 4372 bytes
SHA-256: 09e1d6af0db2358f79532b8cbe9c77cf2ce36cb9360ab7b76c5a102805fbaf6d
font_02_sfnt_off0000e4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BB 10688 bytes
SHA-256: ca0cb0b1fe4196b8531e729195413793eb22c5e2f66dda4f07da9d3da88c068a
font_03_sfnt_off0001096a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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