Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbdba131ae8ef4ef…

MALICIOUS

PDF

95.9 KB Created: 2021-03-25 01:32:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 36ebe439cafc023eee67960a93a71bde SHA-1: b26158cfbe89f65d8d2e3c3da0700ae0e8cda870 SHA-256: fbdba131ae8ef4ef8cdb02867bc1c77e13e4bb06a4ddf57d502b6eaec9d4d0bb
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/award?keyword=walter+benjamin+flaneur+pdf PDF link annotation
    • http://armada.technology/kitchenaid_stand_mixer_costco_ukq8d3x.pdfIn PDF document text
    • https://tunegize.weebly.com/uploads/1/3/4/5/134500295/vujomomogiduwu.pdfIn PDF document text
    • https://kukavijeri.weebly.com/uploads/1/3/3/9/133997324/sapawoviga.pdfIn PDF document text
    • http://wanididezaj.getenjoyment.net/43699293893.pdfIn PDF document text
    • http://zugugalepew.mypressonline.com/adele_when_we_were_young_lyrics_karaoke.pdfIn PDF document text
    • http://futup.ru/freddy_fazbears_pizza_in_utaha4yte.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499635/normal_60059a6ef1418.pdfIn PDF document text
    • http://kpupnov.pro/sexcraft_mod_minecraft_1._7_10tbgyy.pdfIn PDF document text
    • https://zejuwotozago.weebly.com/uploads/1/3/4/6/134647352/6251063.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/questions_to_ask_a_builder_when_building_a_custom_home.pdfIn PDF document text
    • http://steelsho1.club/dog_man_guided_reading_level6dt88.pdfIn PDF document text
    • http://clientbluebadge.com/dumiwugabib6pjwh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_60349a5b2e0c1.pdfIn PDF document text
    • http://pl50off.info/571897066044eaeh.pdfIn PDF document text
    • https://doselarifiniwa.weebly.com/uploads/1/3/2/8/132814949/2335376.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/88002058654.pdfIn PDF document text
    • http://stepka2016.xyz/455935933286m096.pdfIn PDF document text
    • http://blankid.ru/51680992369xrc14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418968/normal_6008216e778cd.pdfIn PDF document text
    • http://idealica-italiaofficial.site/17381954977ll4sl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_6058295a5430d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_62c2f99d78f843c0a292b7716d5ddf49.pdf?index=trueIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_adf43e7ec1bd4c809177442c4fff1fa5.pdf?index=trueIn PDF document text
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_c09936acbd2f49568295f4ec0ed444b0.pdf?index=trueIn PDF document text
    • http://lavapokapajemob.myartsonline.com/wawafizok.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 5008 bytes
SHA-256: 76a281cb1b5ea3cdc5f50096d3fda2d9d344bda207dadbe5d7704b081785e206
font_01_sfnt_off00012c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C5E 6124 bytes
SHA-256: 406d9c14f76b4e0c27267bc63fa971fc1ebe99cb7b762b0c35436d2afb2f8dd6
font_02_sfnt_off00013c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C47 11440 bytes
SHA-256: ea2ea858c454b46bd4b6f25a4e7fb5195129722044b61898b113a698df1705f5
font_03_sfnt_off000161c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3