Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0b3d96bf77f0da…

MALICIOUS

PDF

72.4 KB Created: 2021-06-05 07:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f614e666501feed1a7ae6ba5ea0229b2 SHA-1: 6459dfb2f60ab64245175cac0649eb3f4aee0939 SHA-256: 7a0b3d96bf77f0daaf743fb794ae6b85fe93f9ea207b919a905736fb876ad186
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDF documents. The primary URL, 'https://nomylo.ru/pbw?utm_term=glencoe+health+student+edition+2011+pdf', suggests a lure related to educational materials to entice users to click through. The presence of a large number of external links and the ML classifier's high confidence score indicate a malicious intent, likely to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nomylo.ru/pbw?utm_term=glencoe+health+student+edition+2011+pdf PDF link annotation
    • https://venofizemebesok.weebly.com/uploads/1/3/2/6/132681219/6d7ff0751eec6.pdfIn PDF document text
    • https://peworiwuka.weebly.com/uploads/1/3/4/6/134693567/9786265.pdfIn PDF document text
    • https://menosakisidibus.weebly.com/uploads/1/3/5/3/135391165/9153016.pdfIn PDF document text
    • https://sanepawoja.weebly.com/uploads/1/3/4/5/134579143/5187280.pdfIn PDF document text
    • https://vigelabed.weebly.com/uploads/1/3/4/3/134368569/fexigenigisalisepi.pdfIn PDF document text
    • https://kinefevemupopit.weebly.com/uploads/1/3/4/6/134631160/2bba9d2fd.pdfIn PDF document text
    • https://kusonanozeko.weebly.com/uploads/1/3/0/7/130775507/6814606.pdfIn PDF document text
    • https://velonifiwivuli.weebly.com/uploads/1/3/0/7/130739758/tikid-befale-safanuso-nabeluparivakoj.pdfIn PDF document text
    • https://witudaki.weebly.com/uploads/1/3/4/3/134332653/4527180.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://molosafokaji.pbworks.com/f/bakeragokudijipu.pdfIn PDF document text
    • http://gutopevif.pbworks.com/w/file/fetch/144569196/my_car_says_service_stabilitrak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b33ad847-8dcd-4fff-8a62-ad58026482e7/38408749869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3997a780-6227-40c0-b757-74920c8d0ed1/mosuxugo.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/f/maruwalatusimazibaxuze.pdfIn PDF document text
    • http://vibevekofano.pbworks.com/w/file/fetch/144426219/sorofop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a550c8-596a-4aba-ba4e-92eb5511ff06/why_is_my_iphone_not_charging_in_my_car.pdfIn PDF document text
    • http://fulusivijomu.pbworks.com/w/file/fetch/144477240/barbie_ylba_filmi_izle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4f0e55f-88b6-450a-a625-ab859d4e5e52/how_to_write_a_short_story_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30c500a9-0c06-49eb-9528-11de1a8b1a9b/tixetelatunexojenur.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/earn_to_die_2_hacked_apk_download.pdfIn PDF document text
    • http://fokurid.pbworks.com/w/file/fetch/144645621/pijonuposomofun.pdfIn PDF document text
    • http://mituxap.pbworks.com/w/file/fetch/144423831/imtoo_video_converter_ultimate_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80cc21ba-d6c2-4a7c-81b3-09dc3276eefd/mekexipepabub.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_off0000dc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7E 5504 bytes
SHA-256: 57d06ed9ca8c2e252fe0f4758c3dba334be9314515c0cffc53f6d710b86d0392
font_01_sfnt_off0000ef3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 11000 bytes
SHA-256: 9e36be97475533d53ee61e62e596cb11f6f4c91a9a54ee0e1406cfe2dbd119f3