Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a9f0b464a65e92…

MALICIOUS

PDF

88.1 KB Created: 2021-03-13 17:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7b40e8bbbd34c543ec64f35327b42bd1 SHA-1: 8938f8a6e01b2464649402a2cf1513ad98608557 SHA-256: 85a9f0b464a65e92e51bb27fd57c5b2d4131d77e11e1dec2483968d8628ff7ce
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=transformation+quadratic+functions+worksheet+pdf In PDF document text
    • https://bogemokized.weebly.com/uploads/1/3/4/3/134386998/sogadetedap-kokojivutaxosaw.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/120423819.pdfIn PDF document text
    • http://didezidise.22web.org/pakistan_citizenship_renunciation_form.pdfIn PDF document text
    • https://cdn.sqhk.co/potonefamuve/geSElJp/lumes.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/cLheiiB/20688098304.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/f9X4gid/93827148704.pdfIn PDF document text
    • https://cdn.sqhk.co/baxewoxevum/idZjjNN/99636439690.pdfIn PDF document text
    • https://revafabeku.weebly.com/uploads/1/3/4/7/134708131/fotibab_jobetefexu_vodedewolewux_xewozudumuwo.pdfIn PDF document text
    • http://puwufonizezez.22web.org/84221504021.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/h4oEagU/gateway_b1_test_answers_unit_3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sukokovevaz.atwebpages.com/grasslin_timer_gm40av_instructions.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_91321891064e4300ac67a48fdd490062.pdf?index=trueIn PDF document text
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_f87416075d2f48edba6ad95d33a190e7.pdf?index=trueIn PDF document text
    • https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_696283e4084444768ce003ebc1600f15.pdf?index=trueIn PDF document text
    • http://goludoden.rf.gd/blockchain_pour_les_nuls.pdfIn PDF document text
    • http://woxutonugosafer.epizy.com/likib.pdfIn PDF document text
    • http://vifasuwa.epizy.com/affirmations_for_money_and_wealth_attraction.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_775829e9f9a348989690938bb4c20f21.pdf?index=trueIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_8bb162de44eb469fa6d75d3c83b8a82c.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_d24768e1399a48d2a017ad212b40b5cb.pdf?index=trueIn PDF document text
    • https://6739ca04-605d-4ff4-b4c9-4e5bd75a7819.filesusr.com/ugd/031dda_4a99b07a429a48cc91ff81fb35361f1f.pdf?index=trueIn PDF document text
    • https://dd67658a-cc17-4e1c-bca5-42bf299a485b.filesusr.com/ugd/07a440_37f59320f57544679c095fddb2a5abad.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 5596 bytes
SHA-256: d0bf7033a9f683c5075cbf3505bbc32018ad17daf6f9bed3b94e1e22458270d2
font_01_sfnt_off0001184c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 10884 bytes
SHA-256: 17201586491afacb87d0968e879d7f5498e3c3015d30dbc5a1f2f87868ea3f6f
font_02_sfnt_off00013d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6D 16132 bytes
SHA-256: 4f6d6443d667672870c38ce4e1d364e29e61a0df6fd2d8217a47270b9fff04c9

Open this report in the interactive analyzer, or submit your own file for analysis.