Malicious PDF — malware analysis report

Static analysis result for SHA-256 8621b6f32cb572f4…

MALICIOUS

PDF

87.2 KB Created: 2021-04-03 05:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a276ea154848913b574d0afb30e94106 SHA-1: 4984a4975d5f69bbbace5cc6369275da9c804fff SHA-256: 8621b6f32cb572f44b163c61ff75f45aec96944de2e31b30c8f83b3f4f6ab77d
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and it contains numerous external URIs. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports this, pointing towards the likely intent of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=survival+skills+filmaffinity PDF link annotation
    • http://goworudubilit.iblogger.org/25923383181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5ff426e4343ae.pdfIn PDF document text
    • http://pogibofabut.getenjoyment.net/27027912968.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_602eadc5800eb.pdfIn PDF document text
    • http://bovibuvebus.getenjoyment.net/sanepegeweb.pdfIn PDF document text
    • http://mofemaruwek.sportsontheweb.net/powadilemelewanaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lavemob.epizy.com/bajirao_mastani_full_movie_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/set_repeating_alarm_android_not_working.pdfIn PDF document text
    • http://fomepufasele.atwebpages.com/soduto.pdfIn PDF document text
    • http://ralirajuz.atwebpages.com/barcode_generator_format.pdfIn PDF document text
    • http://xesiduzivodugi.epizy.com/vinilurogawalebax.pdfIn PDF document text
    • http://xovojiga.epizy.com/20623475314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637f9dd4-c2c3-444e-b9c9-693f7c5f2dad/jimitifixerogosiketejisem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/172d5c51-9c1d-45ae-ab03-c006e50a11b6/papodoguwid.pdfIn PDF document text
    • http://zezorug.rf.gd/mefodipinuji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964b53f3-f64e-49f0-8a6e-e05f4bd99722/axial_yeti_jr_parts_diagram.pdfIn PDF document text
    • http://rewelopax.rf.gd/10710644623.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/baaghi_movie_full_hd_2016.pdfIn PDF document text
    • http://kuwexugebukutim.rf.gd/95274732483.pdfIn PDF document text
    • http://tojulov.epizy.com/davow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e1a5a0-f37b-406d-950d-02bd881e7a40/3631144793.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e3221cd-9aac-4eb3-8c0f-1208095d5661/dr_cindy_trimm_commanding_your_morning_prayer.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/cyberpunk_red_review.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_off000112ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AB 5240 bytes
SHA-256: 040924512ccad9ee09a8357333635f26105e73e962251f3b6ffe4cb5c5a3cc79
font_01_sfnt_off00012475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12475 12700 bytes
SHA-256: 72e7d178a1da055a317fec053bb75fbd268ae7c530fc165f2d658a6501b44637

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