Malicious PDF — malware analysis report

Static analysis result for SHA-256 903e6ba5d86f6ae7…

MALICIOUS

PDF

71.1 KB Created: 2021-03-15 20:42:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7fd7c56479c903e8e25ea778c96a6da2 SHA-1: 5ed570552461ccdfd47677fa8dc8fd8ee0d9c12b SHA-256: 903e6ba5d86f6ae7022b46fd52f6ecd2a9c1d070f3442fafcd9768ed1f3de9ea
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 0.9992

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://jottigo.ru/aws?utm_term=el+proceso+de+la+investigaci%25C3%25B3n+cient%25C3%25ADfica+libro+pdf PDF link annotation
    • https://cdn.sqhk.co/jutusaxibu/aniaOgd/11886630788.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/difference_et_repetition_deleuze.pdfIn PDF document text
    • https://cdn.sqhk.co/bodevoposuji/1eblU38/84776592681.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/hjhhhfM/rikutarakunazutukulev.pdfIn PDF document text
    • https://cdn.sqhk.co/lewonuvaxu/jeibTgh/nick_chubb_jersey_shirt.pdfIn PDF document text
    • https://cdn.sqhk.co/bawijodol/ybgeghu/racing_in_car_traffic_driver_ski_accident.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/luwibixajopuzideta.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaku/hbkhdhg/71839852511.pdfIn PDF document text
    • https://cdn.sqhk.co/xerolunem/hjxhhMP/bubble_nest_pet_shop.pdfIn PDF document text
    • http://gojevomarokabe.getenjoyment.net/asbaq_e_najoom.pdfIn PDF document text
    • https://cdn.sqhk.co/netimawifes/X7XqLVo/95085144234.pdfIn PDF document text
    • http://feludekinopotas.scienceontheweb.net/canon_rebel_t5_price_philippines.pdfIn PDF document text
    • https://duroxogudoli.weebly.com/uploads/1/3/4/3/134318703/0b2b0b938eea.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/kotumo.pdfIn PDF document text
    • http://zitarekatinupas.sportsontheweb.net/90444998211.pdfIn PDF document text
    • http://lirinevewafa.mypressonline.com/creo_parametric_2._0_for_designers.pdfIn PDF document text
    • http://sosogemizibu.mypressonline.com/namenisoguronarituxelemoj.pdfIn PDF document text
    • http://zenaxudoriw.mypressonline.com/93069781207.pdfIn PDF document text
    • http://jeseselanus.scienceontheweb.net/1914_luciano_canfora.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/sefipa/kmsnano_activator_office_2013.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/huttodyake_sayodyake_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/1629606286.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/business_in_africa.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_off0000d3b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 5668 bytes
SHA-256: becd4ad0b75dd206f8204437689ddcc7ddba282cec4dc83b9ac491f364ab74e0
font_01_sfnt_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 11460 bytes
SHA-256: 3215a59c2607238d09acf99ec2ff3a00c18e2b60084c5f6a0e9df59eb6e17f7a

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