Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74ad80fbefcc7a1…

MALICIOUS

PDF

92.0 KB Created: 2021-03-04 19:11:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 42f61732159b22c338f238dae5bd5f49 SHA-1: 33332b1118601e96fe0d14b8f0aaea3beb1d19dd SHA-256: f74ad80fbefcc7a1937415f9102f0676c9a68b968c724adebf95a3756b3ffa03
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to be a lure related to cost inquiries, likely intended to redirect users to malicious sites for phishing or malware delivery. No scripts were extracted, but the extensive use of external links suggests an attempt to exploit users through indirect means.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=how+much+does+a+bale+of+pine+straw+cost PDF link annotation
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/kukorepisoba_gevawonajurekab_jofiserogumu.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/11769778142.pdfIn PDF document text
    • https://gejeximiba.weebly.com/uploads/1/3/4/8/134897602/8831836.pdfIn PDF document text
    • http://zefeziwiluj.22web.org/fe_electrical_and_computer_practice_exam_free.pdfIn PDF document text
    • http://selolaz.66ghz.com/xetomakuvonesegepolalajaw.pdfIn PDF document text
    • https://dajitogaxafolix.weebly.com/uploads/1/3/1/1/131164176/e7f940bf1b04c1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jewofeket.onlinewebshop.net/wuxexevapupezuwojitaju.pdfIn PDF document text
    • http://ruxopagotar.epizy.com/beauty_standards_around_the_world.pdfIn PDF document text
    • http://fanalejowegop.atwebpages.com/last_of_the_mohicans_theme_song_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11260fef-b206-4df6-bfa7-e568d73f31e9/livobenixux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5d037b5-4a87-4b07-94a5-cb469acbbd49/why_wont_my_acer_computer_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/348eac8c-9da5-46cc-a92e-c2402ea751db/kugosajatudu.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/97769346773.pdfIn PDF document text
    • http://rigirulame.epizy.com/what_is_the_difference_between_paraphrasing_and_summarizing_explain.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_780878f648894daf9dcb9c22430e1324.pdf?index=trueIn PDF document text
    • http://napubuxuwel.epizy.com/rivomamemoruwu.pdfIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_76a754d6b5c74b59a2600f686155f5f5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/92a023ee-74e3-474f-8abe-156e31eb7dcf/22137549625.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_off00012c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6C 5588 bytes
SHA-256: db670dcc421f5aa87cb7ceb1c6f23bee1790933b10440c2fba32eb8868dae6db
font_01_sfnt_off00013f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4E 10476 bytes
SHA-256: 9f39cc0ceb6223e8308482b97b9ba6bed68fb76429e42746e3406ed9c9b5e004

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