Malicious PDF — malware analysis report

Static analysis result for SHA-256 c779235562a0610c…

MALICIOUS

PDF

90.3 KB Created: 2021-02-25 10:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7d3dc18e10adfbf2b4892df16f740163 SHA-1: e77f4096a022be4076e86084c22bd644d005a92d SHA-256: c779235562a0610c5272ec341f839953b6772608db940450d84f30665fa6d9e3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains and Weebly, indicative of a link farm. This is often used for SEO manipulation or to distribute malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://druttle.ru/wix?keyword=relative+pronouns+and+relative+adverbs+worksheet+pdf PDF link annotation
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/nukati.pdfIn PDF document text
    • http://lnstagramoriginal.com/rifozagavodinirgd3x.pdfIn PDF document text
    • http://pelistens.xyz/kingston_coin_op_laundry_edmond_okx0u3y.pdfIn PDF document text
    • https://limosajabug.weebly.com/uploads/1/3/0/9/130969130/pedomedizuvofifedo.pdfIn PDF document text
    • https://cdn.sqhk.co/dijowasedop/iijf2jj/alone_season_6_winner_jordan_jonas_wife.pdfIn PDF document text
    • https://cdn.sqhk.co/sewadokoka/jdXic3Y/my_etisalat_internet_account.pdfIn PDF document text
    • https://sawefewukiwow.weebly.com/uploads/1/3/1/4/131406412/2a6d81.pdfIn PDF document text
    • https://cdn.sqhk.co/katutilit/hIidbl0/phoenix_suns_logo_history.pdfIn PDF document text
    • https://vuwapelenepaje.weebly.com/uploads/1/3/4/7/134705438/manusevekowoxif-zewivufezov.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/xpgd8Zr/slime_simulator_time_make_super_asmr.pdfIn PDF document text
    • http://mini-cam1.club/gojatuladotonajofa5x1ec.pdfIn PDF document text
    • http://bonifacy.site/i_know_something_you_don_t_know_cartoonfk6lh.pdfIn PDF document text
    • http://firstdoctor.xyz/la_semana_de_coloresh4x6h.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vuzuruzenibu.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/6329072.pdfIn PDF document text
    • https://cdn.sqhk.co/risenulowo/Ehcgfja/the_scary_teacher_granny_branny_survival_mods.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/4WAxCha/jesigad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE8 6440 bytes
SHA-256: 2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb
font_01_sfnt_off00010edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDD 5492 bytes
SHA-256: 0231e21e09ad6f2fb5cd2c3d84094de91dcd6e53b635fcb40a1f93cc0fdd64bc
font_02_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 10556 bytes
SHA-256: eec409be5ed9c6fd6cec5fbf79e7be8e87ea954c4d24486860f339384d03f763
font_03_sfnt_off000145df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145DF 16104 bytes
SHA-256: c6d177dd30d395e9060e148723578c55e109ed4275642439632739a62bb8e54c