Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be126e7be2ee7c4…

MALICIOUS

PDF

79.9 KB Created: 2021-05-31 22:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5c6123e2ceb947edbaacc9ac89b58ce1 SHA-1: 1f4ae1188cce6f7e84591269792c9fff5ba8f103 SHA-256: 3be126e7be2ee7c4d968343bf93b62f8787a2d0aee933ea875b5829ba325f362
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://vilenefex.ru/123?utm_term=project+management+budget+template+word PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4381997/normal_5ff161a443182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446017/normal_6020b8fc06283.pdfIn PDF document text
    • https://lasemekesote.weebly.com/uploads/1/3/4/3/134314396/7184426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495551/normal_605fe02b3820b.pdfIn PDF document text
    • https://rajuwirorevub.weebly.com/uploads/1/3/5/3/135306937/1252009.pdfIn PDF document text
    • https://dugigezulafi.weebly.com/uploads/1/3/4/8/134898894/nusekukuduxukus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409257/normal_604e4e4882f63.pdfIn PDF document text
    • https://pezobarifad.weebly.com/uploads/1/3/5/3/135394950/zovixuv-diwexenapez.pdfIn PDF document text
    • https://mumimobubaw.weebly.com/uploads/1/3/4/6/134640569/b8a7d88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4c152de8-52d5-49b4-9e4f-922016e2197b/fce_essay_writing_samples.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144423855/stres_ynetimi_ve_fke_kontrol_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5702ee4-87b4-4609-b92f-8351091e7e61/how_long_can_a_dog_live_with_arthritis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6e0617a-8b76-487e-b334-b26d101563b5/zusoserugu.pdfIn PDF document text
    • http://xujefix.pbworks.com/w/file/fetch/144422934/dosejajamutebatir.pdfIn PDF document text
    • http://kolelulu.pbworks.com/w/file/fetch/144417120/led_tv_service_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6570c5b-082e-4a3a-a80b-a77053e2b7ea/when_should_i_read_the_trials_of_apollo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f23fa93-2bd6-4fea-8c89-ffecd11fbf27/vujotuwegaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/971096dc-a900-43dd-b8a6-7f5588b4d884/xevuvinatebi.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_off0000ec9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9B 5356 bytes
SHA-256: a34f475f67d439aca0ad9d3ff01023dcad8abe6bd424c5b27b9b840f0a088848
font_01_sfnt_off0000fec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC1 10372 bytes
SHA-256: 9e36aa731eddf6d17dd384c4774bd174634d23f3e0d9902f5e12c4a7f9af5380
font_02_sfnt_off00012219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12219 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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