Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1336ee3fc7f25e…

MALICIOUS

PDF

87.0 KB Created: 2021-03-22 11:08:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7027b76608eecd5f283a4de6a0df1003 SHA-1: 44c74d2c2ffc263a3b68999959f979f60969c16c SHA-256: 2f1336ee3fc7f25ec4e2f53910c180b1928bf04c83ac1a16be91a1ee4cbbd453
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. No scripts were extracted, but the presence of many external URIs suggests the document's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=lvo+2021+kill+team+rules PDF link annotation
    • http://cabinetsly.xyz/using_ham_radio_without_a_licenselc69w.pdfIn PDF document text
    • http://medtechnika1.ru/how_to_use_python_for_beginners_to_excelzab38.pdfIn PDF document text
    • http://salebox.shop/rekupelimokuvarifem7i0w.pdfIn PDF document text
    • https://cdn.sqhk.co/nuzitomizaj/OxhjhhR/space_fighter_2_arcade_download.pdfIn PDF document text
    • https://cdn.sqhk.co/lubigegek/elsX0kI/xifova.pdfIn PDF document text
    • http://canonsburglake.org/cool_outfits_assassin_s_creed_origins1hnmd.pdfIn PDF document text
    • http://ttttrrrr.space/35522297044f37cl.pdfIn PDF document text
    • https://cdn.sqhk.co/jivomawufem/ggXgcKQ/78372407422.pdfIn PDF document text
    • http://classkaod.ru/vipogiwesodufakokug8c.pdfIn PDF document text
    • http://oneitstore.info/sodivuwolowejozekenap4hh4.pdfIn PDF document text
    • http://wordsidepost.top/gomutivogufojofk0pz8.pdfIn PDF document text
    • http://rollernefrit.xyz/car_race_games_free_download_for_laptop5ty1b.pdfIn PDF document text
    • http://zewenidasi.iblogger.org/binomial_theorem_for_cat.pdfIn PDF document text
    • http://dutuvowori.22web.org/72491784988.pdfIn PDF document text
    • http://circulyarkadigital.xyz/diary_of_a_wimpy_kid_rodrick_rules_book_main_charactersq15zp.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/OFxhdZk/figiza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8767aa75-4bd5-48c0-94ca-24e983238001.filesusr.com/ugd/debdc1_007674eb5b2a4f6e8469f1b582491c07.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c3d39c5-ea5c-4465-8e2d-b81057746dba/1960s_dc_comics_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a637097-cd79-464b-ac5b-ec7be1f87cfe/the_holy_quran_arabic_english_ahmadiyya.pdfIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_186dc2ccd358460ab6b37c2e612b40f0.pdf?index=trueIn PDF document text
    • https://26c1613e-5d28-4fa3-89cb-3d2c9ab59faf.filesusr.com/ugd/fe83c3_24a1a1e77f164730a90ab00c92f7a64c.pdf?index=trueIn PDF document text
    • https://drive.google.com/file/d/1xBBqT5aPoA-VKzcrJ_In 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_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 5224 bytes
SHA-256: 271bb0295630097973e84a8305e22da427f05f91910a4893a6b90bbaef06ba90
font_01_sfnt_off000129d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D0 10900 bytes
SHA-256: 4e666c675fb62f60ed029925eaac050421847806218b4956a1e94ce1de59bf55

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