Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35bb4d34d74653d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 00:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cb0713e15db288df89e866e9310bee15 SHA-1: b29eb2a35c9e3f24234006b6dd9e8e54d6b599b0 SHA-256: a35bb4d34d74653dbd57a76fffcb52330c077abcb6f271337a9469b575d0654a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm hosted on disposable domains. The embedded URLs, such as 'https://garglob.ru/uplcv?utm_term=15+best+camera+apps+for+android', likely serve as lures to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://garglob.ru/uplcv?utm_term=15+best+camera+apps+for+android PDF link annotation
    • http://xsteelstock.com/d/files/kofopawukobixilafokazeru.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/249272c7de7a5ea500f4f64cc1518db5/70699069301.pdfIn PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-15/20210915174820657653.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/13193426185.pdfIn PDF document text
    • http://chukguwang.com/files/fckeditor/file/27071290149.pdfIn PDF document text
    • http://ruihuitax.com/files/file/39945879946.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/wibezowoxevu.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/13384840952.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/52504693759.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/37691222493.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/gidavilafutozela.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/debotadapuvijuro.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/fovejijataze.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/19693593535.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/pipitopalefu.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/vizaxapezimuturilifi.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-12/images/files/15248967154.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219765578147.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/20729083061.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/kidatadevejurixejexusur.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/80685965957.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/kujezabatokofobelixeweba.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109030707145946.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://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_off0000bc8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC8A 10964 bytes
SHA-256: f6c350a7184ae994e439276e110d1bd6ae60e4c43f0d0c15c4979094555c38bb
font_01_sfnt_off0000d5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ede3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE3 17668 bytes
SHA-256: 7cdcf852aec248fc9f978a95f0f47ac82b253d633af4fb65cd101c5b0ea4da39

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