Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d05bd1a5ba9482…

MALICIOUS

PDF

75.2 KB Created: 2021-02-16 10:17:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5dfcbb4e95f81d6d1ba1ee41bc3b5358 SHA-1: 2b21591d1af33abe9fd72921fe2bdc71aaf67c15 SHA-256: 90d05bd1a5ba9482b5d9eb17be486916556169b0c711bf3dbeaa3fcfa85fa473
166 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 0.9997

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crophysi.ru/strik?utm_term=list+of+figurative+language+definitions+and+examples PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4476015/normal_5ff771a313e3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416490/normal_6019aafaa8296.pdfIn PDF document text
    • https://zeraxoxuret.weebly.com/uploads/1/3/4/6/134642117/6245589.pdfIn PDF document text
    • https://gorejirulikem.weebly.com/uploads/1/3/4/7/134738880/popafis-kuxazun-kawatozugub.pdfIn PDF document text
    • https://beburasitowetu.weebly.com/uploads/1/3/0/9/130969608/tudodi.pdfIn PDF document text
    • http://instasurprise.online/motosizaxowibiraxuxo843oq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476946/normal_60148de3afff4.pdfIn PDF document text
    • http://cyberghost.store/all_hallows_eve_poem_analysism69xy.pdfIn PDF document text
    • https://cdn.sqhk.co/divabasom/YRbgh3X/word_calm_level_1305.pdfIn PDF document text
    • https://bolowotusupiwam.weebly.com/uploads/1/3/5/3/135300352/wefezowatorapen.pdfIn PDF document text
    • http://forkidsshop.online/rinunuzovatamuzuwomixnc1wj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5fe6121cf23f1.pdfIn PDF document text
    • http://blognews.top/exercice_polygone_ce2_en_lignehw8qp.pdfIn PDF document text
    • http://igbusinessabouthelp.com/gixujurujagazusogowitaredfkkio.pdfIn PDF document text
    • http://liko-sneakers.com/loxalofirojer2dms.pdfIn PDF document text
    • http://weinmvc.net/the_cosmic_conspiracybse1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494160/normal_5fe700e20fe99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuxime/gojetusozo.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/48603932437.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/petolirisiwakefisogop.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_off0000e758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE758 5428 bytes
SHA-256: 228bd915886d363cfb31397a6158e3b23dfb7755d8809ffa669c2923e73056a7
font_01_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 10908 bytes
SHA-256: 7277e20b5fcc4c0eb839fdd308576a8d63e9c758b0e791de181702d1cf244ee0

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