Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f38ad981dd41f34…

MALICIOUS

PDF

71.9 KB Created: 2021-02-01 20:09:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 102306e09f02f55f48787d7be5244931 SHA-1: 479f082ae2486bdf1abcba8263e83a5e92ddce7d SHA-256: 3f38ad981dd41f34bbf846ea5a22459f4353a1ac269340034e506644106a913b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=disable+navigation+bar+android+pie PDF link annotation
    • http://namunogetivij.iblogger.org/bullfrog_spas_x_series_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367914/normal_5ff577ddd2549.pdfIn PDF document text
    • http://scarcebook.com/68880188970gxghg.pdfIn PDF document text
    • http://dapodulasopo.iblogger.org/56244375901.pdfIn PDF document text
    • http://redit.fun/road_race_bike_game_downloadmu5ic.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425506/normal_5fc8143913cd9.pdfIn PDF document text
    • http://kvyovk.xyz/bugunun_saraylisi_1_sub_espanhol9syv7.pdfIn PDF document text
    • http://future-techno.ru/minecraft_zombie_serverenf1z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://majoxokusixapav.epizy.com/belmont_care_home_cqc_report.pdfIn PDF document text
    • http://nekezoxugi.rf.gd/hero_mariah_carey_karaoke.pdfIn PDF document text
    • http://lewuxiboru.epizy.com/jofunofudisado.pdfIn PDF document text
    • http://dadosekim.epizy.com/ctet_question_paper_2016.pdfIn PDF document text
    • http://zebigibozudival.epizy.com/9161226232.pdfIn PDF document text
    • http://zipokuxabatu.rf.gd/jevuranimome.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_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 5324 bytes
SHA-256: 798286124c3b8be3d4cc678b5f6fe25e4f0fcfe4da58d4176e4ce5412ace9e13
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 11380 bytes
SHA-256: e134b1967be0fe4cca9a56c985f06f00b32e205135c2c2a02b99f144523c13a3

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