Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d766e2253d104ed…

MALICIOUS

PDF

65.9 KB Created: 2021-04-01 12:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 111d15e3443b173464dba724dfd6421a SHA-1: 30a150ad82c7dd11be6b92978fb48fa332566afd SHA-256: 7d766e2253d104edad861fa3935a6ed30c30f00a7193b55ea98eb7f60859cb5f
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 on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=bihar+map+blank+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407069/normal_6021c25eb2653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465908/normal_5fffea5b5104f.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/2gchbYn/53503748587.pdfIn PDF document text
    • http://ultra0.space/m_audio_keystation_88_ii_vs_alesis_q88zrz2z.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/deXRoJ9/buseruk.pdfIn PDF document text
    • http://datab.vip/the_history_of_hindu_chemistry_book_kisne_likhibu5uk.pdfIn PDF document text
    • http://carbackseat.site/778749230658mm8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374542/normal_604de01ba13c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458837/normal_5ff691c15731b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366947/normal_5fd900cf9b9e8.pdfIn PDF document text
    • http://eferevole.com/taraweeh_ki_namaz_ka_tarika08in8.pdfIn PDF document text
    • http://webmastervlad.ru/politics_among_nations_morgenthau1gug1.pdfIn PDF document text
    • http://edaruzal.xyz/2181341119j9zdx.pdfIn PDF document text
    • http://technodom11.com/gijotulcjw12.pdfIn PDF document text
    • https://cdn.sqhk.co/womilepeba/hhjdheJ/happy_chef_2_mod_apk_unlimited.pdfIn PDF document text
    • http://iglivesupportteam.com/dave_ramsey_financial_peace_bookr770k.pdfIn PDF document text
    • https://cdn.sqhk.co/libudezetuv/GTMHhbW/roblox_studio_app_chromebook.pdfIn PDF document text
    • http://vizit.store/one_day_my_soul_just_opened_up_audiobook8jiwz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zonivezada/punctuation_rules_english.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/18647147555.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/believer_audio_song_tamil_version.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_off0000c8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D9 5356 bytes
SHA-256: 388d71ce50edc2e9718606cabce7f8f1f4caf8e3d18908da49955d23a77b40db
font_01_sfnt_off0000dad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD7 9312 bytes
SHA-256: 58437e13b8bee0e1f9e6a84fbe8378d255314363e868909d7b3995a889739bba

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