Malicious PDF — malware analysis report

Static analysis result for SHA-256 9019b4d4968cc055…

MALICIOUS

PDF

78.5 KB Created: 2021-06-07 01:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 01294c8002340525ecd1f37db0cafc5b SHA-1: e136afcd394d3722bec0b57210f32f810a70d63d SHA-256: 9019b4d4968cc055db574b366929227a4db9255046c442920fdb346cc742169b
186 Risk Score

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 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=chandu+film+audio+songs PDF link annotation
    • https://reserekeluzor.weebly.com/uploads/1/3/4/7/134721257/nadewikaposa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486201/normal_5fe462147d582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_603839fb634be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414514/normal_60668b4be2119.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406455/normal_605818af36813.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500187/normal_603dc1a6aad62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413017/normal_60059f758167d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_604d2e57ebe3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489050/normal_6012c6b76fd9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372076/normal_5ffb4d343a096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467601/normal_601d63f1799a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402252/normal_60570bffbddc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472768/normal_6032cee0e9d71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408346/normal_5fcc1e74152ba.pdfIn PDF document text
    • https://wojewifonutej.weebly.com/uploads/1/3/4/8/134883442/734c6a.pdfIn PDF document text
    • https://fegemuvu.weebly.com/uploads/1/3/2/6/132695633/sitojijaxomugalexin.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://zezupagijene.pbworks.com/w/file/fetch/144602244/18100574319.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/73381565924.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144412143/vectric_aspire_3.0_keygen.pdfIn PDF document text
    • http://tijigika.pbworks.com/w/file/fetch/144698370/gufitulabovutadezosujidaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b849f18a-dc08-4a8c-a5a9-ea9294091973/jeevandeep_english_grammar_book_9th_class_download.pdfIn PDF document text
    • http://kufogokoges.pbworks.com/w/file/fetch/144560478/44773404851.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f411aefb-6c60-44f3-b359-3b03d4e4abd2/sofej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcb8b906-d3dd-4670-bca2-65a10928d6d4/2010_chevy_malibu_hybrid_reviews.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_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 4932 bytes
SHA-256: ab2f2634305c3a7bedc96465f4ef92961e982bcd1cdf7d8023b3c7506f6724df
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 11280 bytes
SHA-256: 611da7abfabcefdd0820aad6f04e6c82a964e30d6fbe961542afafa879aa1396
font_02_sfnt_off00011ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA4 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71