Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fb185361016108…

MALICIOUS

PDF

82.5 KB Created: 2021-09-18 10:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b991a2aff69ead3d8c2934a93b5b4e9a SHA-1: 6b2446e09f11b2e7bfe4091417e46749c6b605e2 SHA-256: b7fb18536101610846882fa7d54f0dbfa861a15c089f66c1d94d4777ee7a6c33
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://architettoseneca.com/userfiles/files/vuvakokuronofa.pdf In PDF document text
    • http://atut-biuro.com/uploaded/file/likubawojulutazijote.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/bff18eaf941124622f4018aee4757ad7/kixexinomufajijabowofibe.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16216064226.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/notizulakipomogekuzirel.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/dipetesagoxapunopoxere.pdfIn PDF document text
    • http://nemochem.cn/upload/files/86517352992.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/jazapatiwiziruzowobos.pdfIn PDF document text
    • https://khanoomhoteli.com/basefile/khanoomhotelicom/files/3040805338.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/mavuvusesimax.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/zixanud.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109110149245540.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/detix.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/xikabavesadokeme.pdfIn PDF document text
    • http://corkpotters.com/images/gefilokebezipu.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/40393161193.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/44517081932.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614331504186e---30578114384.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/33989396891.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/benam.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/wawetijelinufa.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/80705127795.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/gasimumotupuw.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/pogotolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tamil+hd+movies+download+2021+isaiminiPDF 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_off0000de22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE22 17548 bytes
SHA-256: 0d2bc3fc5b4ca29c260bb959bad23f81e8ce4a3fa2434d8255a2456b1313156e
font_01_sfnt_off00010bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 10724 bytes
SHA-256: 310e3bdb13208a7fa2a3cfddd504d887a7754ae16854ade58c2e9d148a5473f7