Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f3f7dc7767f3c13…

MALICIOUS

PDF

90.1 KB Created: 2021-09-12 00:01:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c7907a2ca1dc173bfbf72d16a19f3135 SHA-1: 3cce243936d003d5a8e7117cbe95b12ae0d3aa3d SHA-256: 3f3f7dc7767f3c135f159a3afa6b3b0aec6e9f9cb6f8ec5817cf0ddaed3a5b76
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

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://huntic.ru/uplcv?utm_term=one+piece+stampede+online+hd PDF link annotation
    • http://ilovechardonnayhills.com/userimages/xixudesugafidam.pdfIn PDF document text
    • https://nasikampung.info/contents/files/nufirutuserilupuboga.pdfIn PDF document text
    • http://www.mecateengenharia.com.br/ckfinder/userfiles/files/debid.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/gekegujibeloduwuvas.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/wegifegi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d82a118792b443b67210db318c21b4d4/wubidusepesilepexexab.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/wowizazenefokud.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/vexevusegetakofuwogub.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/43384422018.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/tomovobekepuwejomazapu.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/27788093415.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/94892212368.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/viwirumonuwesiwaganakoweb.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/kevamekowerozafawagusimos.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/jevegewunepiwa.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/95145039160.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/zidewipula.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/sexipok.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/69832241000.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/fuwijuwobifitox.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/1631346526935412047.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/69459325521.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/tixim.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/79398e7cbeeedf3d8098e577a39f312b/52261148287.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/87733200354.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/siwusun.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/zogus.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 10704 bytes
SHA-256: 772ccd483349f5210a98bf8c604c9282d765bc3a2d3af953242e01b84845637d
font_01_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 20860 bytes
SHA-256: 553a6db7746de4856538d204fdbf4c26e4dc22346f9619ec3665dec6f611731a
font_02_sfnt_off00013608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13608 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E15 2752 bytes
SHA-256: 61e7446501e169464937006d4e7d829f985f768a63a4d26525575217f416561a