Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db01ba0cc207219…

MALICIOUS

PDF

73.2 KB Created: 2021-06-06 22:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1352b3ae7f601c116767f9e5246a9c81 SHA-1: d8616488d51842d96c2ef9eb9c82ec96539da934 SHA-256: 5db01ba0cc2072191751a4ad100a28a04e1590af46b089ce239016cc03764d6a
64 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a high-confidence heuristic flagging it as a link farm on disposable hosting. The primary malicious URL identified is 'https://allytemp.ru/pbw?utm_term=reussir+dalf+c1+pdf', which is likely used to redirect users to a phishing or malware distribution site. The document body, though heavily obfuscated, contains metadata suggesting it is related to language learning materials, serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7297

Heuristics 3

  • 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
  • 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://allytemp.ru/pbw?utm_term=reussir+dalf+c1+pdf
    • https://gojolukok.weebly.com/uploads/1/3/4/4/134455450/pajiwakalo.pdf
    • https://bugituwixumanuz.weebly.com/uploads/1/3/4/7/134722584/guliju.pdf
    • https://cdn-cms.f-static.net/uploads/4472753/normal_60672464dd8ef.pdf
    • https://xebokedobonu.weebly.com/uploads/1/3/4/7/134719403/kupudaxogovun.pdf
    • https://static.s123-cdn-static.com/uploads/4416790/normal_5ff21d70b5426.pdf
    • https://jumomemokipus.weebly.com/uploads/1/3/0/8/130874307/084783328c7090.pdf
    • https://radixukawatezod.weebly.com/uploads/1/3/4/6/134645496/7fa10a1d7b3306.pdf
    • https://cdn-cms.f-static.net/uploads/4390069/normal_6025589029785.pdf
    • https://static.s123-cdn-static.com/uploads/4373264/normal_5ff80759961cb.pdf
    • https://cdn-cms.f-static.net/uploads/4370059/normal_5fd67d6302014.pdf
    • https://cdn-cms.f-static.net/uploads/4446489/normal_6013c0df5f6a6.pdf
    • https://cdn-cms.f-static.net/uploads/4462992/normal_6037e57e536fa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jesababa.pbworks.com/w/file/fetch/144413952/how_to_get_macro_on_agar.io_ipad.pdf
    • http://pupowivala.pbworks.com/f/spss_survival_manual_julie_pallant_download.pdf
    • https://uploads.strikinglycdn.com/files/a5b9c482-f197-4c66-aff0-834420678bd8/the_dolls_house_text_questions_and_answers.pdf
    • https://uploads.strikinglycdn.com/files/54047600-ccde-48fb-835d-844a4b297cf4/44644628695.pdf
    • https://uploads.strikinglycdn.com/files/51c4a2b1-7ebc-43f1-99be-ed3b40559a5a/zulezopo.pdf
    • https://uploads.strikinglycdn.com/files/a8b2c506-68c9-4ef4-9370-19c961f8ba81/79615578200.pdf
    • https://uploads.strikinglycdn.com/files/648fc044-5c37-4f77-9253-7c2a080de956/kebigewidejivejikubaroleg.pdf
    • https://uploads.strikinglycdn.com/files/c8627437-810f-4813-ba0b-620fe941b069/how_to_get_publisher_for_book.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0cf.bin
e1486eb00d7daca6b40cb42540c5f3a8f82aaa239ce08b77fa3e6e8d4ff71bc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 5208 bytes
font_01_sfnt_off0000f29a.bin
3dc5b545d0c3ca7e5a0eba768bbe578bc092a380cd699bffc6a3c1671095ed17
pdf-font-stream PDF embedded font (sfnt) at offset 0xF29A 13060 bytes