Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ff16ebe0dfad55e…

MALICIOUS

PDF

138.1 KB Created: 2021-03-22 13:46:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 071bdec461fe5d71a7e00e19191c4fb8 SHA-1: 22e61d1fa65ab8933cc53e1bab12a56a5032075c SHA-256: 9ff16ebe0dfad55e026dd41b2cb508d24f4dc519971efd7b0d009cfe475e2579
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. Several heuristics indicate a malicious intent, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM. The ML classifier and ClamAV detection strongly suggest maliciousness, likely related to phishing or SEO abuse. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/aws?utm_term=the+handmaid%2527s+tale+margaret+atwood+summary PDF link annotation
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/bosovowelazipesuv.pdfIn PDF document text
    • http://senorifeg.iblogger.org/97247846487.pdfIn PDF document text
    • http://garantiya62.ru/best_option_trading_book_for_beginnersr5vii.pdfIn PDF document text
    • http://xozonline.ru/vlc_for_android_tv_4._4._2fwjrp.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/vikuruninive_dufab_bobeneg.pdfIn PDF document text
    • https://fikadodovawewa.weebly.com/uploads/1/3/4/3/134320255/7073062.pdfIn PDF document text
    • http://rodsfish.club/54532557690ign83.pdfIn PDF document text
    • https://zelubofiwexuf.weebly.com/uploads/1/3/4/2/134234915/2cdbd98df7d6f.pdfIn PDF document text
    • http://ronitojaxebibo.22web.org/75449011685.pdfIn PDF document text
    • http://my-favshopf.online/servicios_en_red_mcgraw_hill_descargarqisb8.pdfIn PDF document text
    • https://begagezegitajaj.weebly.com/uploads/1/3/1/3/131398046/waxodewinufarixe.pdfIn PDF document text
    • https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/ae80209.pdfIn PDF document text
    • http://creditscorecard.info/jason_capital_agej59dq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9fb0fece-6c2a-4f8b-8ff1-5d9ea67f5ee7.filesusr.com/ugd/f6a907_870c7f9311c1450b8886ef4986798418.pdf?index=trueIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_06281698a2cc4cd9a19f4f1240bca708.pdf?index=trueIn PDF document text
    • http://rebamasisagu.epizy.com/lose_or_loose_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b72f1a8-5a51-4751-a7e1-b297eca9f462/genesis_v2100_green.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10379ba-de90-456e-8493-12f073d9e1f8/romeo_y_julieta_2013_trailer.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_20ab640547994475a1bcbe6bec76c233.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/931032da-59ec-4f80-b2c5-27e4f2e6f256/tadomupunagosaneva.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_off0001e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E09A 5416 bytes
SHA-256: ab2ffced8a59efdea5d4b32975b883760f3e10e22008a799989b06c6ed31a4d5
font_01_sfnt_off0001f2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2EF 11820 bytes
SHA-256: 1f0e9e4e2762fbfc66564270f0c78ca952fc00c523c5db83dbc8c373723947fa