Malicious PDF — malware analysis report

Static analysis result for SHA-256 c556c770fc600aab…

MALICIOUS

PDF

73.3 KB Created: 2021-02-26 14:21:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 306c07c4eb4a74df37f81419960824ec SHA-1: f84f3a03b1decbadf3620980234fc840b3b60e10 SHA-256: c556c770fc600aab504538c39fd25e3751335493195eee5ed84e9d94a7dc3e9c
124 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to known malicious redirector infrastructure. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of malicious links suggests an attempt to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/wix?keyword=arc+length+formula+calculus In PDF document text
    • http://pilefubasusuz.iblogger.org/merge_excel_worksheets_into_one_master_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_5fda882f336be.pdfIn PDF document text
    • http://vidclips.design/areopagitica_miltonkq4h2.pdfIn PDF document text
    • http://kudukulid.22web.org/birthday_greeting_cards_for_friend_free.pdfIn PDF document text
    • http://liolika-rsya.ru/the_seven_wonders_of_the_ancient_world_worksheet_answersn02b8.pdfIn PDF document text
    • http://mon-cmbretagne.com/como_conseguir_o_monedero_em_pokemonoqytz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_5fd679e84b28c.pdfIn PDF document text
    • https://pivazadigemeza.weebly.com/uploads/1/3/4/6/134642233/bijomot-xigefipuzavuwe-lejuwenasu-xululazo.pdfIn PDF document text
    • http://doorstepcomputers.com/jasutegaxurebogdv49o.pdfIn PDF document text
    • http://bijipejip.iblogger.org/channel_9_tv_guide_melbourne.pdfIn PDF document text
    • https://pipenibeteza.weebly.com/uploads/1/3/4/5/134508730/8870506.pdfIn PDF document text
    • https://naligunuded.weebly.com/uploads/1/3/4/4/134472871/3857d2725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379744/normal_6001830aaf6e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426816/normal_5fed6446b31a7.pdfIn PDF document text
    • https://pobunusegem.weebly.com/uploads/1/3/4/4/134460984/5117456.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bivoxubi.epizy.com/10525047942.pdfIn PDF document text
    • http://jejafajiw.rf.gd/agilent_hplc_1100_manual.pdfIn PDF document text
    • http://pumamolo.rf.gd/cambridge_latin_course_book_4.pdfIn PDF document text
    • http://rizoweriwofa.epizy.com/zekesoti.pdfIn PDF document text
    • http://vozuxekeve.rf.gd/46830101983.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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 5284 bytes
SHA-256: 784e8efee9a07d865d07827fb69b2d7f0e4b8d086da8da79b5cfd2e47ffb596c
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 10472 bytes
SHA-256: bbced2c561860748447403185bf70824b44647e388ffd0c192024eb1ae7f1c71

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