Malicious PDF — malware analysis report

Static analysis result for SHA-256 1887c3eb68a3e980…

MALICIOUS

PDF

85.9 KB Created: 2021-04-02 03:39:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5ee9b09271e015c3bfbce774afa834cc SHA-1: 52970b94402c68b8ffa6cb815bafc1c7521e2d18 SHA-256: 1887c3eb68a3e980059f3724604f242d86acfd8decb498ec45a6baaf6e15aa43
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 0.9996

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://jottigo.ru/award?keyword=biografie+mihai+eminescu+pdf PDF link annotation
    • https://kelonefak.weebly.com/uploads/1/3/2/6/132683111/256d7.pdfIn PDF document text
    • https://nopovufarake.weebly.com/uploads/1/3/1/3/131379277/muwositaxivepax.pdfIn PDF document text
    • http://davebamonuzove.medianewsonline.com/edit_text_online.pdfIn PDF document text
    • http://fatowafelu.iblogger.org/lymphatic_drainage_of_stomach.pdfIn PDF document text
    • https://cdn.sqhk.co/fomeluxilim/hahe9Xn/gardenscapes_level_2550.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/Ox9jijb/20007556550.pdfIn PDF document text
    • https://budojidotepaso.weebly.com/uploads/1/3/5/3/135312143/gegedafarevit-fazirovavu-welotonitogo-jenamefope.pdfIn PDF document text
    • https://cdn.sqhk.co/puzukebejas/cjeiehb/rupaxojefelajevewati.pdfIn PDF document text
    • http://jenupekob.iblogger.org/68948702074.pdfIn PDF document text
    • https://sidomepavoresob.weebly.com/uploads/1/3/5/3/135322675/4325006.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/essential_words_for_the_ielts_3rd_edition.pdfIn PDF document text
    • https://jagojepenita.weebly.com/uploads/1/3/0/7/130739472/c121dcc1b3a8d3.pdfIn PDF document text
    • https://sofusosixep.weebly.com/uploads/1/3/4/4/134493363/3477799.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/93537508906.pdfIn PDF document text
    • http://suzamajotibe.mywebcommunity.org/ap_cabinet_ministers_in_telugu.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://5c817321-7c0c-448b-959d-deb1da9fd788.filesusr.com/ugd/19103d_4effd55fd7a745a1a1063e24cff17161.pdf?index=trueIn PDF document text
    • https://ea74ff18-003d-4094-8454-8d7e15e33abb.filesusr.com/ugd/50de67_2bf9637c6dfb4d338025b9f59cd6b173.pdf?index=trueIn PDF document text
    • http://besuvom.rf.gd/61751572166.pdfIn PDF document text
    • https://be1d055c-b83b-422e-9e68-1bf13cef350c.filesusr.com/ugd/5b1e3c_565959a15ffa4926b802b2b8952f1a9a.pdf?index=trueIn PDF document text
    • http://jubogaju.atwebpages.com/whirlpool_cabrio_washer_user_manual.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_1c61d92393ff46f69360df9eb445795a.pdf?index=trueIn 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_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 5388 bytes
SHA-256: 2b42357e167b8eaccf2a431cb2d124685129d57a780f8ec59ea1ea198644ef00
font_01_sfnt_off000112b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B1 12584 bytes
SHA-256: 147360e09635cbda7cfe7768be7fe074a34b9a18971d0a2ccd8659bd27fa9874
font_02_sfnt_off00013a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A34 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34