Malicious PDF — malware analysis report

Static analysis result for SHA-256 187826024dc61886…

MALICIOUS

PDF

74.9 KB Created: 2021-04-07 13:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c96c2cb104bef753e2e0a84bd7f8aec1 SHA-1: 725b0dcd3d0c14971896ce46e4a0204a8cf376ae SHA-256: 187826024dc61886819edaec96f9986c25f1ee22e6d2da417ee877d7869df5b8
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://soxebez.ru/strik?utm_term=how+to+reassess+your+chess+4th+pdf PDF link annotation
    • https://videtibap.weebly.com/uploads/1/3/2/6/132682663/7324b725588f6e.pdfIn PDF document text
    • http://organicnu.info/lorevilelifomobosulubz2u.pdfIn PDF document text
    • https://nevedaroxizewav.weebly.com/uploads/1/3/4/5/134592578/3739808.pdfIn PDF document text
    • https://senoxifogixuj.weebly.com/uploads/1/3/4/7/134769413/naraboluzibi.pdfIn PDF document text
    • http://affilateapp.online/tefererurazujuwedoxopelmk0o.pdfIn PDF document text
    • https://lokejefu.weebly.com/uploads/1/3/5/3/135301848/7467d3a3b2.pdfIn PDF document text
    • http://world-wild-shop.com/how_do_you_crochet_a_beanie_hat_for_beginnerskcwu1.pdfIn PDF document text
    • http://life-news.tech/massey_ferguson_35_petrol_workshop_manual5vdzz.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/timekanovinodar.pdfIn PDF document text
    • https://bewobuvepo.weebly.com/uploads/1/3/2/6/132695749/fobim.pdfIn PDF document text
    • http://edaruzal.xyz/free_template_html5_one_pagekg0ti.pdfIn PDF document text
    • http://vbruti.site/vinupepefimomozomojadopa3vnan.pdfIn PDF document text
    • http://plsale.pro/8611645467go76t.pdfIn PDF document text
    • https://dokalifuli.weebly.com/uploads/1/3/4/0/134096730/ee0482ba6945f3.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/8573883.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2c09393-fe4f-454e-8bbe-8e4ed2cf921f/laxunonezigemewaxofide.pdfIn PDF document text
    • http://banidokote.epizy.com/85249234189.pdfIn PDF document text
    • http://badakun.rf.gd/birthday_special_songs_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52cdb3d7-add4-42ea-9a71-deb34c4a8950/capital_markets_middle_office_analyst_1_wells_fargo.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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 5452 bytes
SHA-256: cff1ce4810209114f331c84beea312fb322bc439e5f887c904affb069ec6f676
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 10608 bytes
SHA-256: 81eb78c8bf9d6c0402c1f6a68707d2c50344ee1e6299563bf3e37c9207b6e113

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