Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64e15dacb8065fe…

MALICIOUS

PDF

75.1 KB Created: 2021-04-18 14:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 71777b54bdf897bb41046b859c1da175 SHA-1: 78244d26718d921e058bdf9a29ec2e2ca13bf5de SHA-256: c64e15dacb8065fe67d1a75ac5ad903b5674cdb466edfdb231a58bf8fd1e3b56
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a mass external PDF link farm. The document body, though heavily obfuscated, suggests a lure related to 'Korean grammar book online'. The presence of numerous external links, including one pointing to a potential second-stage PDF payload, strongly suggests this PDF is designed to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 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.
  • 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://maypoin.ru/strik?utm_term=korean+grammar+book+online PDF link annotation
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/mazevab_detub_xefiladokekovek_tigomujefer.pdfIn PDF document text
    • http://deflecfcvy.best/44217270335mas4r.pdfIn PDF document text
    • http://samelike.site/2007_honda_civic_si_owners_manual0qdp5.pdfIn PDF document text
    • http://rafale.store/68722427765nrxk9.pdfIn PDF document text
    • https://zipixaxunisegon.weebly.com/uploads/1/3/4/6/134625234/6493739.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/f9004a.pdfIn PDF document text
    • http://luwakixifotizim.iblogger.org/rules_of_playing_pool.pdfIn PDF document text
    • https://fivitilanafime.weebly.com/uploads/1/3/5/3/135395402/01479c4de4d5078.pdfIn PDF document text
    • https://kokubexajaluk.weebly.com/uploads/1/3/2/6/132681668/gaziloxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dakovupogoz.rf.gd/tavoziritakejewetupiziri.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/inductive_and_deductive_arguments.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/45944811827.pdfIn PDF document text
    • http://jiditorugap.epizy.com/mr_coffee_coffee_maker_ratings.pdfIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_b5a724dd53cd470eb298b4aeacca9628.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/free_reverse_image_search_software.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/wheres_my_refund_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/critical_ops_mod_menu_ios.pdfIn PDF document text
    • http://gilebufamefaf.rf.gd/lejawepewivukafuj.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/corrosion_science_author_guidelines.pdfIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_af04962475134b8b858a1c706b43ef01.pdf?index=trueIn PDF document text
    • https://5d55c623-01b0-417f-8131-8dfd0334080c.filesusr.com/ugd/9ef046_232bb22aac1d4383be312e6ebf785e48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujodibu/35024573767.pdfIn PDF document text
    • https://s3.amazonaws.com/besafefaf/arputham_athisayam_intha_aandu_song.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 5000 bytes
SHA-256: 9ccb00fa6c034837e81a26fe8dcd52003bdbd6cd0aaf6b4086d52830495df36d
font_01_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 10892 bytes
SHA-256: 9504a15ef340e2954763d6cfc6eadbda2620f3d9282e09eac3bfa6cbc05e2463

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