Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a7416f113285732…

MALICIOUS

PDF

73.4 KB Created: 2021-03-29 22:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a90354f865942ebb1022f7bb372328ef SHA-1: 7dc22e8721025b13434892ab2e633a73852ccfc8 SHA-256: 1a7416f113285732044025790d8bd7eee92f817fa351e44f8e111fa31c8bcd4e
126 Risk Score

Malware Insights

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

The file is a PDF document that exhibits characteristics of a phishing trojan, as indicated by ML classification and ClamAV detection. It contains numerous embedded URLs, many of which point to disposable hosting or unknown domains, suggesting an attempt to redirect users to malicious content. The PDF's structure and the presence of external URIs, combined with the high ML score, strongly indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://interplast.ru/meme_sticker_pack_for_whatsapp_iosfhlhv.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4449766/normal_6009111fb4bac.pdfIn PDF document text
    • http://ubzvp.com/686884839294l837.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408471/normal_604d111e54e36.pdfIn PDF document text
    • http://smirno.life/what_is_the_best_stock_market_to_buyx4jc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489988/normal_5fe763804c9a1.pdfIn PDF document text
    • http://moneyindia.site/22356632697s54i9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480383/normal_6059179963451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497358/normal_601badd58ab08.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/B9wesDdUo4k/wb?keyword=network+%20guide%20to%20networks%207th%20edition%20chapter%205PDF link annotation
    • https://s3.amazonaws.com/sifawekujiki/kixigopawaxakavila.pdfIn PDF document text
    • http://mubufelijora.epizy.com/39239432399.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45180771-ff27-48f8-81f5-eb6e32c9bdb2/financial_accounting_for_managers_mba_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8bb8511-83e5-4f9d-b91e-2ca9a180d716/history_of_the_singer_201_2_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/current_affairs_2017_mcqs_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34c3e3bf-7f18-4878-a793-6b1459831ac6/12235105853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897b646c-ba1b-46b8-8902-19954910cc74/swann_720p_security_system_manual.pdfIn PDF document text
    • http://muxajetolalet.epizy.com/liwamofukiwojibowuruluf.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/houston_astros_schedule.pdfIn PDF document text
    • http://mozabufapimil.epizy.com/art_history_podcasts_2020.pdfIn PDF document text
    • http://zopujozeze.rf.gd/arduino_uno_r3_atmega328p_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/dagubosupudezawu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cec25a6d-a533-4060-b59b-129208ad2f87/fuliduxipira.pdfIn PDF document text
    • http://nidedos.rf.gd/59558706495.pdfIn PDF document text
    • http://mojofukiw.epizy.com/boogeyman_tamil_dubbed_movie.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BB 5512 bytes
SHA-256: 0af9c8859f745608ab30500f9532c1087877c7573c4442cac2a476458d67e6af
font_01_sfnt_off0000e799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE799 10016 bytes
SHA-256: 38bf830b87b7a1d591d93953df0bbd953b450e016e360e332630813c63d74be7
font_02_sfnt_off000109ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EF 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333