Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae9b68b10af955b…

MALICIOUS

PDF

79.2 KB Created: 2021-04-11 18:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 54a03cea67dc5a722dc8751807022339 SHA-1: 151eb2c1222a21b9abb233a45f9ef7f96d0ac469 SHA-256: aae9b68b10af955b36ee4b07964bcfa1ff5539fbb84629fbe85428af7a3260c9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm or phishing infrastructure. The document body, though heavily obfuscated, appears to contain search query-like text, reinforcing the phishing lure hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/strik?utm_term=how+much+sodium+in+taco+bell+chalupa+box PDF link annotation
    • http://pokypka.xyz/what_number_do_i_call_to_cancel_dish_networkgagji.pdfIn PDF document text
    • https://vakejijumusefuv.weebly.com/uploads/1/3/5/3/135313512/puferewatevoz.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/95826117170.pdfIn PDF document text
    • https://gitizurozid.weebly.com/uploads/1/3/0/7/130775734/vewamu.pdfIn PDF document text
    • http://formverifiedbadge.com/bsc_forensic_science_syllabus_downloadukgh5.pdfIn PDF document text
    • http://nesarose.sportsontheweb.net/nosagodenelifarulaleleji.pdfIn PDF document text
    • http://ravigimojamel.mypressonline.com/fumuneleledenakuxif.pdfIn PDF document text
    • http://piter.store/ryobi_pressure_washer_extension_wand_home_depotxjezq.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/zibarusija_sinagewenote_panepof_popaxazedakoxez.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/pdf_file_merger_splitter_online.pdfIn PDF document text
    • https://fokinovev.weebly.com/uploads/1/3/0/7/130775288/konalowekavi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455399/normal_5fc9a86c7c637.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_601c9708294cb.pdfIn PDF document text
    • http://ru-dev.xyz/water_pollution_information_in_english_file6131k.pdfIn PDF document text
    • http://liketime.fun/xamarin_android_google_maps_examplentjis.pdfIn PDF document text
    • http://praktika-ingenieur.com/renewavezagosivuxav9z3xz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lofese/vimurategu.pdfIn PDF document text
    • http://zevusup.atwebpages.com/logam_alkali_tanah.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/basic_python_learning_book.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/3ds_max_2011_crack_file.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 5476 bytes
SHA-256: 1191ecafd611a0b823990aa58f4b0b571a92eabea17d013d0831c64726ef8dee
font_01_sfnt_off000108a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A5 11408 bytes
SHA-256: 91b1b5d90bad69084b8e5ec3bd6744b28e3516d2a0115b5d705c1319ca9ec18f

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