Malicious PDF — malware analysis report

Static analysis result for SHA-256 8340d3e3584be97e…

MALICIOUS

PDF

77.5 KB Created: 2021-04-16 19:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 11f7ea25bee0394683a31e0bf4a829a0 SHA-1: 3e2c6584f02f556dfa9e86f8c62419ea831c28af SHA-256: 8340d3e3584be97e735d8575a1cdcb5f8e09d033e781021c8ab76504221a2a0b
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://xezojetit.ru/strik?utm_term=how+to+make+a+homemade+humidor PDF link annotation
    • http://ijmalan.xyz/megexasasuruxak1m7i.pdfIn PDF document text
    • http://insuranceautousa.com/noxonijhzz2h.pdfIn PDF document text
    • https://kanodofeju.weebly.com/uploads/1/3/5/3/135325650/jopanekugad_julunumizise_tolamugaraku.pdfIn PDF document text
    • https://lirefabagobaxi.weebly.com/uploads/1/3/4/0/134012393/c8d6a.pdfIn PDF document text
    • http://rcasino.info/cell_structure_and_function_worksheet_part_24tkf0.pdfIn PDF document text
    • http://bufo.online/commendation_letterrg7j3.pdfIn PDF document text
    • http://canlisohbetim.net/nike_air_force_1_07_womens_white_size_9xtk0w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_6018a01aa69de.pdfIn PDF document text
    • https://kezugavamatuwe.weebly.com/uploads/1/3/5/3/135347357/71355.pdfIn PDF document text
    • http://heleogose.online/rukofbl1h7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_602a19c18bfa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482648/normal_5fdd88b5a15d2.pdfIn PDF document text
    • http://imedo.ru/42850982481qf4m1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420905/normal_5fcc39ab22049.pdfIn PDF document text
    • http://jadebey-x.com/kapef1slbu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417220/normal_600817115ccfc.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
    • https://s3.amazonaws.com/falevi/72255045299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1d5e4ae-ee38-44a1-87cd-96b7e1da4a37/25390491577.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/56388935941.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/dnd_5e_best_campaigns_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d77d7d0a-b17f-4657-aa03-2488307d1a66/82034829988.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c30c675f-ebca-4612-9f65-1194969382ea/why_is_technical_writing_important_for_engineers.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/wibologovazifu.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/practical_reliability_engineering_o_connor_free.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_off0000e49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49F 4748 bytes
SHA-256: ff6eaae36377fa4a0ee4e879278c81e82f45faaedd8974bb646c374215ca325e
font_01_sfnt_off0000f4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C5 10948 bytes
SHA-256: 65ea5271cf14de9386f619f51eaf89dbbf58694802eb5831abb0147d135c1052
font_02_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333