Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4be262cd73753b…

MALICIOUS

PDF

87.4 KB Created: 2021-05-30 07:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3172dd63ee5464fcf5207e717f6d963d SHA-1: aeafb0b9bfd70fb4dc2bcb8423a1f832f711685d SHA-256: 0d4be262cd73753b2e87caafc9bd2523b1e209e55177d1f9a7915151301bdfc6
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=prison+break+season+3+subtitles+english+download+720p+yify PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369507/normal_6003273ac2689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408478/normal_606c0d7d19f62.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/xogamefole.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373520/normal_5feb0b1667173.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381302/normal_5ffcd2cc8a1d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377371/normal_6020a4b80fc84.pdfIn PDF document text
    • https://zejofisedefumot.weebly.com/uploads/1/3/4/6/134667534/lugogukesaru-lepop-mevizoj.pdfIn PDF document text
    • https://pufoxufuzevelo.weebly.com/uploads/1/3/4/4/134486621/3641388.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478933/normal_5fe3ff3c7b4a9.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/nigodewu_bexoridonunizo_tigudiro_rukowidutogexuw.pdfIn PDF document text
    • https://berajuvexoru.weebly.com/uploads/1/3/1/8/131860787/wikaz_vanemusaraxeril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_600a7ac37be6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490252/normal_60616ffeee9e8.pdfIn PDF document text
    • https://gizafagubezuz.weebly.com/uploads/1/3/5/3/135321184/fobiworixejeraluz.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/f6e01e10-36fc-48b6-b8af-900344049f6c/32925832076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1d1105-6839-4581-bd51-605101d4378d/links_awakening_switch_review_metacritic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cbe01bb-9c29-43c8-ae8e-0dba8489412d/73871139320.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44cbff86-6eeb-4104-8ad9-8590b1be4a24/17440910555.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba6e3ac2-c04a-4e6e-9868-bb95fa9d035b/skyworth_43_4k_uhd_smart_tv_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2b59236-7cb1-4c0c-94e1-292f294ef067/japezowilosowed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13538177-54fc-4fa4-8aae-2cbca4431603/40724473650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e879b2f5-071e-40d8-8ab9-629e849d347a/under_the_dome_season_3_episode_1_sinhala_sub.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 3288 bytes
SHA-256: d0cbd741b3a1ab6038ccfdd364acb4b4d955b4618f85e689e8a1f026ec1ecc1e
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 6220 bytes
SHA-256: 76ebacd5de1866bf365926e6bd6d0025c67b0a4b5cb45f69cf19a785d4bf8b59
font_02_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 12564 bytes
SHA-256: 3431f5c47fe8b0857cf1862cfdecf685bc25c94b0aed379ca9ec341c6349b835
font_03_sfnt_off000137cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CD 16684 bytes
SHA-256: 4fb18f2f8d176c0c9ddf893a3a69c6eaaaf8ae8309617b6e07033971a2ed751b