Malicious PDF — malware analysis report

Static analysis result for SHA-256 adb3380b4b4c643e…

MALICIOUS

PDF

75.1 KB Created: 2021-05-02 09:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d272aa2503014c9d5ef73d6a3d07c23e SHA-1: 419b09c530e14d803857453f30782776bae89163 SHA-256: adb3380b4b4c643ef70c7d447931fd43a84cc2861aa1694ae83ae9c58dc4db2a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, characteristic of a link farm designed to manipulate search engine results or distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests the PDF itself is a lure to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=apple+time+capsule+power+supply+replacement PDF link annotation
    • https://cdn.sqhk.co/zebimapajod/ejTafLK/nagujudekogem.pdfIn PDF document text
    • https://fupemotajupatis.weebly.com/uploads/1/3/4/7/134718556/f819dc9e474114.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/edhbjbt/watch_spy_games_2020_online_free.pdfIn PDF document text
    • http://musomojil.mywebcommunity.org/vovugudejapifebovikep.pdfIn PDF document text
    • https://gofizunesiwez.weebly.com/uploads/1/3/0/8/130874053/koxanabud_vewunoki_japobogapapobu_vawosopog.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxilumevo/jenIphc/sabonegutizonakifuwenave.pdfIn PDF document text
    • https://cdn.sqhk.co/melipetoluf/ifrkjbn/games_with_cheat_codes_ps4.pdfIn PDF document text
    • https://cdn.sqhk.co/salavogi/jj1rWzS/25596598746.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/approaches_to_management_development.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/ihhcI4S/lucky_life_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/iiCqpgf/city_car_driver_2020_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosewude/2WCC0S6/zumilejikavepatamazure.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/XigjeDO/best_video_maker_apple.pdfIn PDF document text
    • https://wimaxexuxiwob.weebly.com/uploads/1/3/0/8/130874544/6990179.pdfIn PDF document text
    • https://dudefusuze.weebly.com/uploads/1/3/4/6/134628774/c2a2719a2b2b.pdfIn PDF document text
    • http://juborad.mywebcommunity.org/asmaul_husna_bahasa_indonesia.pdfIn PDF document text
    • http://widaluvawigomum.scienceontheweb.net/advanced_trainer_key.pdfIn PDF document text
    • https://giliwafe.weebly.com/uploads/1/3/4/0/134016831/8594818.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/RMjhgeT/fejigebufubudowigalone.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/vxvq6hh/79815978379.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/NigVkfY/snake_idle_python_code.pdfIn PDF document text
    • https://cdn.sqhk.co/vujixete/ageFNha/vegizesifavareberabafi.pdfIn PDF document text
    • https://cdn.sqhk.co/totarujined/bwXiiLr/figumidagodezazilen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wuwedilejom.myartsonline.com/personal_branding.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_off0000e8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DB 5260 bytes
SHA-256: 777f8de44e06cf34927ca7c360363b9c8cd83faab520b5d6229d0c34fad13a8c
font_01_sfnt_off0000fabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABB 10552 bytes
SHA-256: ce7adab023e77b7f00d339611886a04914be277d7ba86dcd9a11bfbdc50d8803