Malicious PDF — malware analysis report

Static analysis result for SHA-256 e15687c25221811b…

MALICIOUS

PDF

69.0 KB Created: 2021-03-22 10:39:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 0e9f9f6fcfabcaa5d9923827de02936c SHA-1: 5563134502c5318c23ee52c2d91f9e3c60d33c84 SHA-256: e15687c25221811b1dcb1e47127de38765ff99b3b79d97ebbee6dce58acf9ba2
244 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a suspicious URL, disguised with a seemingly innocuous video title. This heuristic, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The PDF also hosts a large number of external links, many pointing to disposable domains, indicating a link farm used for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=alvida+alvida+mahe+ramzan+status+video In PDF document text
    • http://straponartist.com/vuvusudabidabid57oml.pdfIn PDF document text
    • https://zerakekume.weebly.com/uploads/1/3/0/7/130739742/cf7c8a1168.pdfIn PDF document text
    • https://bubebozozuj.weebly.com/uploads/1/3/1/8/131871643/c1c167c8e.pdfIn PDF document text
    • https://lutolobod.weebly.com/uploads/1/3/4/1/134108863/davorodukegi.pdfIn PDF document text
    • https://motedozanegiraz.weebly.com/uploads/1/3/1/3/131383309/2820208.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/list_of_international_accounting_standards_2020.pdfIn PDF document text
    • http://devicesprotectionforusers.site/999481886269x026.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/9268889.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/black_and_decker_handy_steamer.pdfIn PDF document text
    • https://voxonexagigiwal.weebly.com/uploads/1/3/5/3/135346225/9384f660e7214.pdfIn PDF document text
    • https://kibugisire.weebly.com/uploads/1/3/4/0/134018652/4947182.pdfIn PDF document text
    • https://wirolubu.weebly.com/uploads/1/3/1/4/131453990/4137989.pdfIn PDF document text
    • http://copyright-notice-ig.com/95976354295aei1k.pdfIn PDF document text
    • https://wokulenazaxur.weebly.com/uploads/1/3/4/7/134744474/5424a8f6bc48a54.pdfIn PDF document text
    • https://gufulesem.weebly.com/uploads/1/3/4/6/134698375/lakarutosu.pdfIn PDF document text
    • http://tells.fun/zuxosif23wg.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/widiku/rocefin_im_bula.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_0cc6ce187fcd45138bf610846e2c3bd5.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_83807d9cdd134785bef655b908c4a103.pdf?index=trueIn PDF document text
    • https://c4a0f302-b060-43a0-af10-a0364da5eca7.filesusr.com/ugd/c6d327_18165a20099b49c6ae5015b308d7e63c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevopemosod/80681934522.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/ge_logiq_e_ultrasound_machine_for_sale.pdfIn PDF document text
    • https://bc260b4e-efc2-469d-9102-9c7234992d76.filesusr.com/ugd/b1b3ad_45cf2241225a429a979dde96309be5cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/41751687635.pdfIn PDF document text
    • http://zegiwewezenaro.myartsonline.com/another_word_for_bringing_back_memories.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC973 5164 bytes
SHA-256: d6a7a6f40754c0a88e35dcc6ff5a7d8fe4657c9716794d8467c61c5a987758ba
font_01_sfnt_off0000dad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD5 1952 bytes
SHA-256: 3f2ce2d979b81614d089de1b14f9f3dd670f7a5e49bbd6cf1a199f19e29dc309
font_02_sfnt_off0000e43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43B 9820 bytes
SHA-256: 14350d3d06bf8e395ae11bc926340a865ef789bee3c309d81cb3ad9c2e566e28

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