Malicious PDF — malware analysis report

Static analysis result for SHA-256 de763ee6305119db…

MALICIOUS

PDF

76.9 KB Created: 2021-09-08 19:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df6aade85152c2fb748debc92b51ffb4 SHA-1: 746b4233dd4243233c56148ad1cabfb64c8c9c1c SHA-256: de763ee6305119dbdb6fa4cce16c1e9bc33b8c4e444e027a340779083a4af14c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or link-farming operation. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://lazerom.pro/media/file/59480935308.pdf In PDF document text
    • https://tekmaker.com/upload/files/nujibesi.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/wigijifikifojowemavi.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/6347232700.pdfIn PDF document text
    • https://seger.cz/userfiles/file/subamatoxekukabasalatir.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345aba0a51d---99577469633.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/logixasilamifemibo.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210907160759931.pdfIn PDF document text
    • https://olterus.info/contents/files/suresetaralixenevuzare.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/94287256477.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/worelamevisanixutolo.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/bemuvigaloturuti.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/496030554.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/mejaj.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090512561173499.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/xikalerimosiromuzarujak.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/12916537687.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/letuzuzebowejufuli.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/lapujurumozixot.pdfIn PDF document text
    • https://digireg.gr/upload/totoguzijeronojor.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/c2cabb15badbbd0da5d23db6d75c3dec/degiwerosozerazerupofo.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/wesupabakuritunalake.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/78324985834.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/3279317726.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mercruiser+4.3+service+manual+pdfPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 16556 bytes
SHA-256: bfb8c91ee3d29979f522fa5fad36c13a9d0c8910b2681a5943150e80937d4d2a
font_02_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 11040 bytes
SHA-256: 6c90f5cb03592e9b7785d5da7b6ef25005b9549079a04b116d53fbdfd726570e