Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ffaf9f662295ff…

MALICIOUS

PDF

81.3 KB Created: 2021-03-09 10:47:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c168b3813385e146e623d5d008e762d1 SHA-1: ee57fb84b39137c432050e31e9d5c37201e8e1a8 SHA-256: 21ffaf9f662295ffb560aef0ecf2c2e0e4ebecb734c8011a2c0613a5a04dc65d
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, with one specifically pointing to a URL that includes 'song sheet music pdf' in the query parameters, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further supporting a phishing or malicious distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://golowaki.ru/123?utm_term=joseph%2527+s+song+sheet+music+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476941/normal_602a108a64dd7.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/81803989098.pdfIn PDF document text
    • http://menformula.xyz/gepusadi8jjur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484997/normal_5fef9e80d85a8.pdfIn PDF document text
    • http://babbieshop.ru/bede_academy_uniform_shop_2019w3lmq.pdfIn PDF document text
    • http://uablog.website/newudifamidelufafefde1w.pdfIn PDF document text
    • http://edalovert.xyz/38062072106840z0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_6026b9cbbafc1.pdfIn PDF document text
    • http://vorgazme.com/hey_whipple_squeeze_this_5th_editiontbyut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446921/normal_5fca8334709b1.pdfIn PDF document text
    • http://shoes-storie.club/voluvarabukijiguzapidinvz.pdfIn PDF document text
    • http://phulop.store/how_to_install_hp_laserjet_pro_m1212nf_multifunction_printergdy7h.pdfIn PDF document text
    • http://itasummer.fun/13350387093961nl.pdfIn PDF document text
    • http://hotel-engels.ru/sad_love_story_to_read_in_englishl93ur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488139/normal_60043041e3a41.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/51966711907.pdfIn PDF document text
    • http://ketousa.site/wituwuvefibiwir46qa.pdfIn PDF document text
    • http://shoes-storie.club/jerisimedorafaf41.pdfIn PDF document text
    • http://shop-you.xyz/samsung_galaxy_tab_4_7.0_release_dateo4j8b.pdfIn PDF document text
    • http://private-channel.site/42859603912theds.pdfIn PDF document text
    • http://nakanilo.club/254342611032jnkz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c2099a-78bf-46d8-9aac-93f8d1bfefed/mevufor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d46e726b-f655-469f-b864-45b5c1923021/wowefagumigilalikozezobu.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/tivadori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b94f5bd-a23a-4687-8c6d-78a42af43d36/what_are_the_health_care_delivery_system.pdfIn PDF document text
    • http://sufixis.myartsonline.com/lagegenobuwepesaxejagala.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0168db1-3ac6-4141-b229-66b4bb5a7b2c/how_do_you_reset_the_ice_maker_on_a_samsung_refrigerator.pdfIn PDF document text
    • http://limoxukuk.atwebpages.com/american_gods_season_1_episode_3_synopsis.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_off000100cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CD 5252 bytes
SHA-256: 1f07a75a0cdd9c06e9370edc506010fb9bd571404859963fa4a35520ae41c4e0
font_01_sfnt_off0001129b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129B 10588 bytes
SHA-256: e59d74f83fea4994017016f3701e09f0105c43591d7668c01bb0440a1aff2b78