Malicious PDF — malware analysis report

Static analysis result for SHA-256 10736f06203b7f3e…

MALICIOUS

PDF

114.9 KB Created: 2021-04-05 18:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c26f1bfe1d8dccd6d5062197d25a693 SHA-1: 79aa14b94cb9d65e0e01fea755e3af683b3a9404 SHA-256: 10736f06203b7f3eacda4482de90f1575ad4fba6e49ee19fe993549211812c50
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' in one of the URLs indicates a potential tracking mechanism for phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=asus+p9x79+deluxe+memory+compatibility
    • http://riniwovefaraw.22web.org/sheet_metal_gauge_to_millimeters.pdf
    • http://tesopinafap.22web.org/guided_reading_for_ell_students.pdf
    • http://rabisuxegebe.iblogger.org/pugumom.pdf
    • https://jodawebodo.weebly.com/uploads/1/3/4/6/134634345/8486487.pdf
    • https://lofokuvowuvi.weebly.com/uploads/1/3/4/3/134362742/namarurodimile.pdf
    • http://kudikadip.getenjoyment.net/excel_2013_download_mac.pdf
    • http://losamaresufalu.22web.org/wimujalug.pdf
    • https://zofazozudu.weebly.com/uploads/1/3/0/7/130739697/d764f33447662.pdf
    • http://wirajamosilun.22web.org/bcbs_il_medicaid_prior_auth_form.pdf
    • http://sotinifox.22web.org/morphology_of_brachiopods.pdf
    • http://medilawibume.scienceontheweb.net/aminoacidos_ramificados.pdf
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/rafunugojamejegev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dodavofonov.rf.gd/13308838817.pdf
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_bcba97ac7dc54e319749384dbc6415aa.pdf?index=true
    • http://fataragoreb.myartsonline.com/93216101961.pdf
    • http://fuxewon.epizy.com/28725228923.pdf
    • https://s3.amazonaws.com/dexodekelaseki/satuloripidaxopagevox.pdf
    • http://nojititama.epizy.com/naomi_junichiro_tanizaki_read_online.pdf
    • http://gijafusatuvaxoj.rf.gd/35991433296.pdf
    • https://s3.amazonaws.com/retisovojor/merger_and_acquisition_examples.pdf
    • https://s3.amazonaws.com/sefabe/english_dictionary_word_meaning.pdf
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_7456e6104fc5420e9bf57e6eeeabdcc2.pdf?index=true
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_5853f63be3914772a547497c3767e2d6.pdf?index=true
    • http://padegijogul.atwebpages.com/beware_of_pity_stefan_zweig.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ef0.bin
776742c3e46157a190edad277a6b48c58a43dde6e94fc2239f4344e13287efdf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 6608 bytes
font_01_sfnt_off00013f2d.bin
1ff7b2cfd7d450d998118f2935b53414bbee804aec8bbedfd53659855b515c5f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2D 3272 bytes
font_02_sfnt_off00014ad4.bin
e309832782f2748eee00534c5929f31986671bfb006f281c182c2c5559557627
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD4 5752 bytes
font_03_sfnt_off00015e5c.bin
c7a0857ce7b1ccf58e5bed0a6ae5dc0556aa1cdff0258fb6080825fe92601256
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E5C 16548 bytes
font_04_sfnt_off0001938c.bin
7e1b8edc3b1474c059a5a7223b6edc0d1d40ce96319c9b8bfb9a4152bb1b120e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1938C 17128 bytes
font_05_sfnt_off0001ac91.bin
b5bcee897f5cd82a953a79815ed68fa9b5c28620dab33c9aaf3562c30bcc3329
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC91 6084 bytes