Malicious PDF — malware analysis report

Static analysis result for SHA-256 a572e99d930766a4…

MALICIOUS

PDF

74.3 KB Created: 2021-02-17 09:54:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 958e8bb168d004f563c7ed0c77f20dfa SHA-1: 5d69b941f0a233fcf6d97cddd04530e9f9e59895 SHA-256: a572e99d930766a4807ca32e3dcae05ca8bffc2e26e5ac1e6f59f10c9c5e7d67
184 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further confirm its malicious nature. The document body, though heavily obfuscated, appears to contain a lure related to printer setup, likely intended to trick the user into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=hp+officejet+4630+printer+connect+to+wifi In PDF document text
    • https://cdn-cms.f-static.net/uploads/4495058/normal_6026881134759.pdfIn PDF document text
    • https://cdn.sqhk.co/karadirimose/j1suOD2/suvojomuvup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377410/normal_6013d9bdcb0cb.pdfIn PDF document text
    • http://baxijemapuzoxu.22web.org/autocad_inventor_free_student.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/bhaR6id/totally_accurate_battle_simulator_download_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/dilereku/bWQGYhd/vawufajew.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/Tjbggtf/super_fancy_pants_adventure_game_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387701/normal_600c08ec7a416.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/jiigk8D/49112718188.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/XghajgO/shooter_mcgavin_running_gif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449987/normal_600057f029fec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371524/normal_5fd861aeac723.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/fjerGjf/snake_and_ladder_game_printable.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491725/normal_5fe1575a3ac10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zonavopom.rf.gd/championship_manager_5_completo.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/best_android_mobile_phones_2019_in_india.pdfIn PDF document text
    • http://zejagal.rf.gd/buat_akun_facebook_baru_lewat_hp_android.pdfIn PDF document text
    • http://zitamekoliliwe.rf.gd/50909142254.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64F 5268 bytes
SHA-256: 4c881a5b22807e616b649e212537b267182fc6a65d0eda9c4c226e67c72f1041
font_01_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 10344 bytes
SHA-256: d552ea4a1741688431fd9b604c71d6536798be6d44da3df93966ba82b6625276

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