Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ad315ddd839c69…

MALICIOUS

PDF

87.7 KB Created: 2021-04-14 07:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25950a63cde3dc1bd49fbf71ff19febc SHA-1: 7ceaf781c7ec041aa39cd4d40167daa0d6594cac SHA-256: 54ad315ddd839c692c608be704cab8293f53a9d517c9061249f51e4e293d0072
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded links likely serve to redirect users to phishing sites or to download further malicious payloads, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 6

  • 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.
  • 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://jacksth.ru/strik?utm_term=upcoming+tom+clancy+games+2020
    • https://cdn.sqhk.co/gofejenizew/8tQ4ehh/54654597606.pdf
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/xosab-jofanipela-warejataliwo.pdf
    • https://cdn.sqhk.co/xesozugis/cEWEnjj/leo_tiger_man.pdf
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/nadizezub-bewebalatusami-feraniwivix.pdf
    • https://pabitunevogozut.weebly.com/uploads/1/3/0/7/130776295/4612806.pdf
    • https://dirujewe.weebly.com/uploads/1/3/4/6/134677456/4334405.pdf
    • https://cdn.sqhk.co/kagelemovo/1PHRhcn/talking_friends_2012.pdf
    • https://cdn.sqhk.co/lexijunibul/aGqgfhg/swahili_to_english_translator_free_download.pdf
    • https://mixutuxo.weebly.com/uploads/1/3/4/6/134692071/jelovesapekekuxuxude.pdf
    • https://labegemi.weebly.com/uploads/1/3/4/7/134709462/xemulawu_kuses_deduxuzali.pdf
    • https://cdn.sqhk.co/muvenetu/CCdjije/3170102536.pdf
    • https://baforaze.weebly.com/uploads/1/3/4/7/134756429/repogegej.pdf
    • https://guvepilafofifiv.weebly.com/uploads/1/3/4/6/134682232/fd475661c.pdf
    • http://nexekeb.iblogger.org/4405143213.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dotivaf/nilawuvaba.pdf
    • http://duzobujunetokuz.epizy.com/canara_bank_stock_statement_form_nf_902_download.pdf
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_4c2c35fbc8bb451fa59430c739453171.pdf?index=true
    • https://s3.amazonaws.com/rekawexuretowo/how_to_disassemble_a_whirlpool_top_load_washer.pdf
    • https://s3.amazonaws.com/jakujakula/activinspire_online_free_no.pdf
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_58eaf6469c94482497de3c9ae8e1cee7.pdf?index=true
    • https://23da7c74-6e14-424a-b22a-901aa35eafb1.filesusr.com/ugd/9cc572_a31c49c9b67e488ead1d521ab9437413.pdf?index=true
    • http://tagitefidunun.epizy.com/cno_jurisprudence_exam_questions_and_answers.pdf
    • http://lamekukibudinos.epizy.com/telecharger_bordereau_de_declaration_des_salaires_cnss_maroc.pdf
    • https://4c38db24-2924-4bf2-81c9-04860d987a69.filesusr.com/ugd/a68d8f_1fe18d4112844de6847fd9d7c74032fc.pdf?index=true
    • https://s3.amazonaws.com/desekusoxi/zufodelil.pdf
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_38656df5659d4be3b043f246d3a981c1.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116fd.bin
63b97a87b9e242683ee64a1a0f566f09e59e8fbddaee9946d6e67068b92c77e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x116FD 5524 bytes
font_01_sfnt_off000129c4.bin
083a2c628fa83f102ce1ee5975b8d502a06105e11bacdd2e49936bb96bea40a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x129C4 11872 bytes