Malicious PDF — malware analysis report

Static analysis result for SHA-256 840a6f090f1a1794…

MALICIOUS

PDF

73.6 KB Created: 2021-10-01 00:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: dc72d12e2f2a0feaaba6d36287760271 SHA-1: 6f6411624e14da7940578c86ac0c4533932e29a4 SHA-256: 840a6f090f1a1794f32a2ba1015267efda9c710a6a93e85d77d924cc28cf044c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://grupopiscis.com/upload/files/sokapejolav.pdf In PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/44442487942.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/toselerekowupopodipaniv.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/nokulafobebepapimu.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/todexinopa.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16143ccebd50e4---55615266853.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///10394640362.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/8253156251.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/juvosaweg.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/93790344261.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/91630644153.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/70017950059.pdfIn PDF document text
    • http://ks-klinika.ru/ckfinder/userfiles/files/29896573280.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/4484e3823daafb5a1555ee625ce555a8/30364043663.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/zetibi.pdfIn PDF document text
    • http://cwesp.biz/upload/file/91104945334.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/84606331455.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/dajoladivejusiju.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/futesopav.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090511444573499.pdfIn PDF document text
    • https://kultmotor.virtualbodybuilding.hu/images/files/80730990277.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/26526835167.pdfIn PDF document text
    • http://fuli-capital.com/userfiles/file/tolefipisetinafokona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=se+puede+entrar+ala+deep+web+desde+androidPDF 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_off0000b896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AD 10784 bytes
SHA-256: 4cd3112704f4e8f4bf6f43ad32715e52a0b7c655a44f73c16fa1b998e922e6bf
font_02_sfnt_off0000e96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96D 18444 bytes
SHA-256: 656d268ee158deb2ed98fe7359ef1d47709a0c3420f97163cbd7d83983dd949c