Malicious PDF — malware analysis report

Static analysis result for SHA-256 a830df59dff48709…

MALICIOUS

PDF

77.8 KB Created: 2021-03-23 20:00:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 259d892ee4a356026b2983ef88547e2d SHA-1: 3ec2d56d581716c7dcc138906cd32df02e6934cc SHA-256: a830df59dff48709c78f8561bdc715e697e52f3efea2b780ed86b756d278a4b3
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various PDF files, many hosted on disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this by identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/award?keyword=arihant+neet+books+pdf+free+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369900/normal_60561d6c69c59.pdfIn PDF document text
    • http://djami.ru/kn_m3_to_pcf_calculator6r5ds.pdfIn PDF document text
    • http://sosiwawivijomo.scienceontheweb.net/bamotasurazonubijiwa.pdfIn PDF document text
    • http://avtovishki-msk.ru/dogisabunixhj5zf.pdfIn PDF document text
    • http://avbox.org/writing_task_1_process_ielts_mentor4e3ff.pdfIn PDF document text
    • http://robinmani.site/sikusevagisakukic6oix.pdfIn PDF document text
    • http://prostosite.site/capresso_coffee_grinder_and_brewerfnrn6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487005/normal_600cdede857e3.pdfIn PDF document text
    • http://alluniversity.fun/craft_palace_pro_online_gamewr4jz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404529/normal_602a415cbcab5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448558/normal_5ff8b40b9307b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413966/normal_6022a20cb9821.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446374/normal_604f8b4788caf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463279/normal_605310203e9b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482415/normal_600907e1177f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372740/normal_5fd0476419e41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gumusimigogasuz.onlinewebshop.net/lejebuwefitetugagesolar.pdfIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/discrete_probability_distribution_exercises.pdfIn PDF document text
    • http://famomijis.onlinewebshop.net/hunger_games_book_file.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/artificial_insemination_in_sheep_and_goat.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_off0000f116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF116 5412 bytes
SHA-256: 817702fa17506e9cab68a50b913425b62863b0f40f1e34aef97bd162d643f344
font_01_sfnt_off00010384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10384 11140 bytes
SHA-256: fbad0517762739a18cb9f13f0b181ee8bd69792c654974819f9b853e9cac5ee1

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