Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc32544dc8f3b77d…

MALICIOUS

PDF

76.6 KB Created: 2021-02-15 18:21:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f7a00c9366768641ffbc9cc686417d20 SHA-1: 427a019a751004e07655a1e6f9b9787942648767 SHA-256: cc32544dc8f3b77d7bac7ff059580fc863dc3bcb0aae354e5c2eb7d5aa710a12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://maypoin.ru/wix?keyword=hair%252Ffiber+evidence+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/lokijuzim/cgfjdLD/50.pdfIn PDF document text
    • https://dixufewopirar.weebly.com/uploads/1/3/0/7/130775961/f96126523.pdfIn PDF document text
    • http://fifamarketbot.com/biginugiwegvzhk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_60143b395bf9e.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/eEgcSWD/lego_green_ninja_mech_dragon_amazon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379471/normal_5fc8cf7886134.pdfIn PDF document text
    • http://akb54.ru/xotubitopikarematu9o1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407997/normal_5fe1220227211.pdfIn PDF document text
    • https://bapumora.weebly.com/uploads/1/3/2/7/132740837/2989087.pdfIn PDF document text
    • https://fotagajumiveba.weebly.com/uploads/1/3/1/4/131411987/990d51.pdfIn PDF document text
    • http://onenature.space/up_board_class_12_maths_syllabus6p0y6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fe8a801cae9c.pdfIn PDF document text
    • https://vejewumuwuwaja.weebly.com/uploads/1/3/4/7/134759129/cdd9a0e30.pdfIn PDF document text
    • http://vorecan.space/51560910311zl82k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452398/normal_5feb8a1182e1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371498/normal_602a931344ae2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://puwomuf.rf.gd/myopenmath_assessment_answers.pdfIn PDF document text
    • http://mevedokepovi.epizy.com/dpmap_employee_input_worksheet.pdfIn PDF document text
    • http://nejoman.rf.gd/fenogu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 5220 bytes
SHA-256: 63e309fddaf5f80f19ca9ee22c2ca5354612db3e739afcbf279101858cc6ee20
font_01_sfnt_off0000f043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 11636 bytes
SHA-256: be0b6968b6dd0d0eeaea8dc5c2afa85cf1b6198ece579e05f71a32ec7fff1890
font_02_sfnt_off0001166b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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