Malicious PDF — malware analysis report

Static analysis result for SHA-256 1117b25be41f4af8…

MALICIOUS

PDF

76.5 KB Created: 2021-03-25 17:05:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c0ca4a20ed52f6d241ceaa7ce07d9098 SHA-1: 5c7282319151e140a33e512f3b94c49b0653040a SHA-256: 1117b25be41f4af856aed2b8e73629585515581fc5ff0c0b848774fbfabfceb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to disposable domains, many of which are presented as PDF files, suggesting a link farm or redirection scheme. The document body, though heavily corrupted, contains keywords related to 'photoshop brushes' and the authoring application, indicating a lure to attract users to these malicious sites.

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://nipisod.ru/wix?keyword=rainbow+text+brushes+for+photoshop PDF link annotation
    • http://luxomozuk.mypressonline.com/how_to_get_mp3_on_iphone_11.pdfIn PDF document text
    • http://xuxijosut.sportsontheweb.net/how_do_trees_look_like_in_summer.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/80710508483.pdfIn PDF document text
    • https://jefabulovonaju.weebly.com/uploads/1/3/1/4/131438419/5228409.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/48533733670.pdfIn PDF document text
    • http://mobijogizex.22web.org/tv_listings_guide_canada.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/java_programming_basics.pdfIn PDF document text
    • http://trokot-new.online/waive_notice_period_resignation_letterkizj9.pdfIn PDF document text
    • http://neojust.ru/free_offline_music_player_for_iosvxcn1.pdfIn PDF document text
    • http://gojoges.iblogger.org/ladiwigeb.pdfIn PDF document text
    • https://wudegilunukoga.weebly.com/uploads/1/3/1/3/131379548/3bcfc207e2.pdfIn PDF document text
    • http://raisinsapp.club/problem_solving_worksheets_for_10_year_olds87bsn.pdfIn PDF document text
    • http://xozowilozoga.mywebcommunity.org/vebol.pdfIn PDF document text
    • https://regutipedazuvi.weebly.com/uploads/1/3/1/0/131071249/6eedf71df6d.pdfIn PDF document text
    • http://majedox.iblogger.org/what_are_the_elements_of_a_short_story_and_their_meaning.pdfIn PDF document text
    • http://sabaroxuxonefib.iblogger.org/29073164028.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://madepadejatutof.onlinewebshop.net/cherry_tree_poem_questions_and_answers.pdfIn PDF document text
    • http://sozizuw.rf.gd/al_quran_karim.pdfIn PDF document text
    • http://josejutolaxof.rf.gd/kipatovosuxokisogopezef.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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 5148 bytes
SHA-256: ccc74592dfd7dcb2b7dfe415ee30c74e6f42272338725d15ce30c079067bc241
font_01_sfnt_off0000f03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03C 10768 bytes
SHA-256: 84bbb29d93facaa1e0bd66a1ba7d0cb2e067a412d7d564e5e8ef398b010ad034
font_02_sfnt_off000114df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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