Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d5d3b2536a9b5c…

MALICIOUS

PDF

81.8 KB Created: 2021-03-19 12:15:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b0566693f7959c2cee12a0ab7379379a SHA-1: 82314f582621f31d4e3311397d74a50459b12294 SHA-256: 61d5d3b2536a9b5c90f419220e4c3a78390c915504541e3fdb90d296da0a43b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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/123?utm_term=bikini+body+guide+week+2+legs PDF link annotation
    • http://trokot-online.xyz/9156700206db9m8.pdfIn PDF document text
    • http://rorejidefozuroz.iblogger.org/goat_castration.pdfIn PDF document text
    • http://zovofuti.mygamesonline.org/l_angelus_en_latin.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/zheWjjR/35336304613.pdfIn PDF document text
    • http://favodokoleti.mypressonline.com/zoxosemaxikoxef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378855/normal_6023ececa9d24.pdfIn PDF document text
    • http://xexuraneralera.22web.org/what_is_simple_interest_in_terms_of_economics.pdfIn PDF document text
    • http://vonexalux.sportsontheweb.net/zuzeluxitimakawole.pdfIn PDF document text
    • http://kulixebuvalafin.iblogger.org/john_deere_trs21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375690/normal_5fcc8034ca58a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476152/normal_5fe748ee3b094.pdfIn PDF document text
    • http://the-job.ru/rixumozitudakenaa4gc1.pdfIn PDF document text
    • https://cdn.sqhk.co/lukavago/iisiija/avatharam_album_song.pdfIn PDF document text
    • https://cdn.sqhk.co/sepagumal/hj5gcu0/light_mineral_oil_walmart_canada.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/hhSiihj/island_21a_pointe_au_baril.pdfIn PDF document text
    • http://obmenkalnr.online/ursula_dronke_poetic_eddaq91f5.pdfIn PDF document text
    • https://cdn.sqhk.co/vukixukafoga/jfjhLTZ/4897254629.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://revudipepofaten.myartsonline.com/kekexuzofosidutuda.pdfIn PDF document text
    • http://xugowosapiri.rf.gd/57254130430.pdfIn PDF document text
    • http://fuzadakeju.epizy.com/divabujobafodeboxubi.pdfIn PDF document text
    • http://kepepisex.epizy.com/68213508197.pdfIn PDF document text
    • http://komadolosa.rf.gd/font_cartoonist_kooky.pdfIn PDF document text
    • http://gofirog.epizy.com/bombay_dyeing_cartoon_double_bedsheet.pdfIn PDF document text
    • http://zepedijuva.epizy.com/venture_capital_funding_report_q2_2018.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_off0000e9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A7 5264 bytes
SHA-256: 06d1a6879c6bec2ae354c5738a954bce293833d7e16f9df96ba205b7692f1778
font_01_sfnt_off0000fbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC9 11132 bytes
SHA-256: 8f6f63efe041492dae0fbc0a7d71190b7fb4afee18f0664e191bca3c8b0a96a6
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 16312 bytes
SHA-256: aad9bc0f36eadc3314e08670b59090120051e308b357201f134af3d0b781b2b0