Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb83d7d1c6831ca4…

MALICIOUS

PDF

72.3 KB Created: 2021-01-13 16:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6a69f33bf5e63f0e845d0e4c96230db0 SHA-1: cfb9ef8ebfccc948bcffb21deafd3d1e78c77a9b SHA-256: bb83d7d1c6831ca4421bdd9ccaaa99dda6243e3212fb9ce9b167661011e70e94
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an MFA/2FA-themed lure. 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 0.9997

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://trafffe.ru/aws?utm_term=make+calls+using+wifi+android PDF link annotation
    • https://site-1177236.mozfiles.com/files/1177236/dunkin_donuts_drift_caramel_craze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379614/normal_5fe41999cbd45.pdfIn PDF document text
    • https://cdn.sqhk.co/vedanoderifu/r3PAIgf/microsoft_outlook_organize_your_email_calendar_download.pdfIn PDF document text
    • https://site-1173271.mozfiles.com/files/1173271/fun_math_activities_for_kindergarten_at_home.pdfIn PDF document text
    • https://site-1213735.mozfiles.com/files/1213735/101_games_in_1_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/jbiauhg/vujivinevufolojatu.pdfIn PDF document text
    • https://cdn.sqhk.co/bugabowozi/jdiargh/dokizebusovupilukage.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/7AgdhbX/usar_stickers_de_telegram_en_whatsapp_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/jumupebuvi/eji2iaN/jusitumawakiboxiwipedel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501634/normal_5fb4aae19421a.pdfIn PDF document text
    • https://cdn.sqhk.co/masunidupag/egdnngf/32508861709.pdfIn PDF document text
    • https://site-1179882.mozfiles.com/files/1179882/waxokom.pdfIn PDF document text
    • https://site-1168441.mozfiles.com/files/1168441/rave_panic_button.pdfIn PDF document text
    • https://site-1196780.mozfiles.com/files/1196780/zegiworumisejevafafemi.pdfIn PDF document text
    • https://cdn.sqhk.co/vafodagusun/haKjhVW/14204804611.pdfIn PDF document text
    • https://ruvetuse.weebly.com/uploads/1/3/4/6/134618438/sorikapemeweb.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
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02D 5352 bytes
SHA-256: e634ebcae108f4915151bade881057e235a46784cbb2a724c1f8e6933491ac98
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 9916 bytes
SHA-256: b5639d01773fa6612213b5c0ebefcb1e89f35e952a490d4cfc26491a3cab8c3c

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