Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ad05b972839b16…

MALICIOUS

PDF

72.7 KB Created: 2021-01-18 15:11:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0a235352f533bb42ebea1314c9bf4295 SHA-1: 024f570d230ba757841158ff9c35a75cc048f68f SHA-256: 27ad05b972839b164886b745980115acef0ceea3d0007fe30e0d2f11cdc4a474
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous embedded URLs, many of which point to disposable domains and link farms, suggesting an attempt to redirect users to malicious content or download unwanted software. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this phishing lure.

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://baarspo.ru/123?utm_term=descargar+ultimate+guitar+tabs+%2526+chords+apk+full+gratis PDF link annotation
    • https://cdn.sqhk.co/pigajifaw/gcthhT2/widugazewukebad.pdfIn PDF document text
    • https://cdn.sqhk.co/saboxiwago/deJnZ6m/59388869221.pdfIn PDF document text
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/3507195.pdfIn PDF document text
    • https://site-1193425.mozfiles.com/files/1193425/57019518559.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/22891b1943f73e.pdfIn PDF document text
    • https://xodumusekow.weebly.com/uploads/1/3/4/7/134708755/jixuxebino.pdfIn PDF document text
    • https://site-1166680.mozfiles.com/files/1166680/animal_coloring_pages_for_adults_easy.pdfIn PDF document text
    • https://zikagedatudupoz.weebly.com/uploads/1/3/4/2/134266226/4658508.pdfIn PDF document text
    • https://cdn.sqhk.co/kixagixupo/rif6jci/59135566657.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxiniraz/hgiyYJ9/nivosa.pdfIn PDF document text
    • https://felupujefokedab.weebly.com/uploads/1/3/4/6/134621420/sijug.pdfIn PDF document text
    • https://site-1177196.mozfiles.com/files/1177196/88106898859.pdfIn PDF document text
    • https://site-1167994.mozfiles.com/files/1167994/75841065440.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/ZR1mxhh/98992685536.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://zosanugu.epizy.com/46958331042.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/travel_magazine_sample.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/avital_ronell_books.pdfIn PDF document text
    • http://jijabivu.epizy.com/single_bed_sheet_combo_online.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_off0000d328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD328 4924 bytes
SHA-256: dc859e15989c6f9d463f997c99e61de1659027492b5a0dfa27425c95bb1a9f21
font_01_sfnt_off0000e3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3ED 10500 bytes
SHA-256: 35d9477277c4103495b763195fc161bdac27f9600bed3740955bcb17598abd8a
font_02_sfnt_off000107ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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