Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b6d7f689f8529fd…

MALICIOUS

PDF

81.9 KB Created: 2021-03-29 22:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 663841f82f9f8fae68eb1a9f6b11e145 SHA-1: 9225230b3279994d77e01ac8a872a4917e027315 SHA-256: 0b6d7f689f8529fd7e16adb8c963d5da8da238e578fb44f38cc08d45d97bace9
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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 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.
  • 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://ponafet.ru/strik?utm_term=jupyter+notebook+no+such+file+or+directory+windows PDF link annotation
    • https://wesifepanegu.weebly.com/uploads/1/3/4/3/134337407/12aed2602317.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/kxjeiiK/how_to_play_among_us_with_100_players.pdfIn PDF document text
    • https://fugomunufu.weebly.com/uploads/1/3/4/5/134586131/4555761.pdfIn PDF document text
    • https://cdn.sqhk.co/titesojijuko/egdheif/14963492724.pdfIn PDF document text
    • http://famixadip.22web.org/citoplasma_estructura_y_funcion.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/0DcijbZ/nipunekolukukifemelexe.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/jcjj4ij/veligavode.pdfIn PDF document text
    • https://pofogixalozog.weebly.com/uploads/1/3/5/3/135346485/980547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_60470f5f37a09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384035/normal_6031e0b796e04.pdfIn PDF document text
    • http://keborejozupe.22web.org/charlie_and_the_chocolate_factory_cast_1971_teacher.pdfIn PDF document text
    • https://jasesinokez.weebly.com/uploads/1/3/1/1/131164090/tikamaf_bafadagimagozog_sugojase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372737/normal_5fca33fa59be8.pdfIn PDF document text
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/lawakosadaj.pdfIn PDF document text
    • http://ruboperuba.iblogger.org/distributed_systems_book_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vorinugobol/fZAidaS/catanzaro_informa_allerta_meteo_domani.pdfIn PDF document text
    • http://tells.fun/xatiji8dsr9.pdfIn PDF document text
    • http://5coupons.info/celik_mup_rsgvsrw.pdfIn PDF document text
    • http://mydenverneighborhoods.com/practice_problems_in_mendelian_genetics_worksheet_answerstcepn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xupewosupegosax.epizy.com/ti_83_calculator_for_iphone.pdfIn PDF document text
    • http://duvexarido.epizy.com/xekok.pdfIn PDF document text
    • http://petefuzaz.epizy.com/askep_pada_bblr.pdfIn PDF document text
    • http://tuguwobafadurot.rf.gd/lagu_athalla_naufal_salahkah_aku.pdfIn PDF document text
    • http://kuwoguki.epizy.com/71551698544.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
    • 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_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 5420 bytes
SHA-256: a8b73ba6fbe0728aba87d95f6f00529fcaf6bff6635cf935fcbaf8a68b52c5b1
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 18948 bytes
SHA-256: f3cdc0cbabe47be0d21e538cca8359043559b65db984bd192b3e4b3569e3bdd3
font_02_sfnt_off00012420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12420 16232 bytes
SHA-256: 1d4ebd634e9a4b1afc3ba2e660f7abdbad7ecfb3c20c2fb0daf688bec4f9a1d5