Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2900dcfed79c6be…

MALICIOUS

PDF

73.1 KB Created: 2021-02-15 12:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 53baa1225721f88bfedf57d99be472fc SHA-1: f31c7223c4f3766a1a6df01f5d4fd22100c85e64 SHA-256: c2900dcfed79c6beb006db041b25e46ceea3f8e452a2d4f43500e665e1ae7751
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://crophysi.ru/strik?utm_term=list+of+character+defects+and+opposites PDF link annotation
    • https://fafutetigav.weebly.com/uploads/1/3/0/7/130775448/wubazuj.pdfIn PDF document text
    • https://cdn.sqhk.co/dakagugi/gjicgdO/fulaturexipadumetepit.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/zasezugodojuri_sasetagefex.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/ja6aXFJ/86944707449.pdfIn PDF document text
    • https://cdn.sqhk.co/kulukopupiw/zibgihe/lofudegumejajex.pdfIn PDF document text
    • https://mukavotedi.weebly.com/uploads/1/3/1/8/131856112/podipukilo.pdfIn PDF document text
    • https://boferisavupase.weebly.com/uploads/1/3/1/3/131384298/sabetisogozedomikaga.pdfIn PDF document text
    • https://bapudemajupi.weebly.com/uploads/1/3/1/4/131438294/9025217.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/bhdgjEB/tangled_doll_with_long_hair.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/3cd283c12131.pdfIn PDF document text
    • https://molulodanewiv.weebly.com/uploads/1/3/1/6/131606256/jibofomata_wupisofeduli_siwakov_kobipej.pdfIn PDF document text
    • https://cdn.sqhk.co/mevojazix/eicWie1/identity_v_danganronpa_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411229/normal_60146d32afbb8.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/dSgefis/swift_current_soccer_office.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/ghhHWjj/libaxonapuzibov.pdfIn PDF document text
    • https://zukevijidogokil.weebly.com/uploads/1/3/0/7/130738647/bavok.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/jesidofefe/flute_sheet_music_for_disney_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/99800670552.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/xiligubu.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_off0000e27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27E 5152 bytes
SHA-256: 1a332a9dedb1fb27466b92b18c25a174220f406a32de986b95f1a67c7242152d
font_01_sfnt_off0000f409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF409 10200 bytes
SHA-256: 52b5a7ede259df92b50793c9faeb75babb6923f04f6925afff08bb52cb8a1d37

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