Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c6e4f354fd1c5e…

MALICIOUS

PDF

74.3 KB Created: 2021-03-08 14:09:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 56904a89ef6f597b27f5a9bc9408a42b SHA-1: a5617a7b384608069a1fa4b76ad76f548c9a517d SHA-256: c3c6e4f354fd1c5e23ac72c52bb727831f764047f8c4e99ad0eea86f0cdbe706
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal Application Data

The sample is a PDF document flagged by multiple heuristics, including ML classification and ClamAV, as malicious and a phishing lure. The heuristic 'SE_MFA_LURE' indicates the document is designed to harvest credentials or MFA approval. The numerous embedded URLs, many hosted on disposable domains, suggest a broad phishing campaign.

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
  • 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://bologen.ru/award?keyword=wastewater+treatment+process+flow+diagram+pdf PDF link annotation
    • http://rabiwitijif.medianewsonline.com/garmin_gns_430_manual.pdfIn PDF document text
    • http://kagaromorin.medianewsonline.com/manujovobefukatujinezem.pdfIn PDF document text
    • http://fobativ.mywebcommunity.org/pusokobamiwidezitulev.pdfIn PDF document text
    • https://peliwotamo.weebly.com/uploads/1/3/5/3/135325711/vukorepome.pdfIn PDF document text
    • https://gulukuse.weebly.com/uploads/1/3/2/7/132740430/6208455.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/16701746659.pdfIn PDF document text
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/fapinitarinuba.pdfIn PDF document text
    • http://winoxolupuvil.getenjoyment.net/nawonimev.pdfIn PDF document text
    • https://tateleref.weebly.com/uploads/1/3/5/3/135322569/437a948c39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391649/normal_603094fc2be49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_603f3a4b49a89.pdfIn PDF document text
    • http://nevinidonet.mywebcommunity.org/bourree_bach_guitar.pdfIn PDF document text
    • https://xesufomoma.weebly.com/uploads/1/3/1/0/131070197/b748b.pdfIn PDF document text
    • http://sevowina.medianewsonline.com/logitech_create_keyboard_backlight_not_working.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/abf0a15bde7151.pdfIn PDF document text
    • http://finonit.mypressonline.com/how_much_do_interior_designer_make_a_year.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458144/normal_6031fb3eafa64.pdfIn PDF document text
    • https://gegizadewer.weebly.com/uploads/1/3/1/4/131482997/a1041f.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/zamuriza/how_to_start_coding_on_a_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/ditodokipaginojeto.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_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 5580 bytes
SHA-256: 1e1db47aaeed93a4b9daa3df74f2dc8a2ad15277be8908c918da6be60dcaa6d0
font_01_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 10832 bytes
SHA-256: 8d2695ce4032d4f1d2dedc0d5e27f4f18421724012c0fb9c17200f7499b9ada0

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