Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b7f1648ecd1cbd6…

MALICIOUS

PDF

82.5 KB Created: 2021-03-15 16:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 255690fd6335e510b1acf994bcad8638 SHA-1: 5961e74cabee16cfe1f6ed7a4aa66e718345cf75 SHA-256: 9b7f1648ecd1cbd605002ddf46c7af3660d8b827cf28d6fcd8139a71f9c99d8e
134 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dugedepap.ru/123?utm_term=cbse+guide+class+11+sample+papers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372399/normal_601172fd994fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_602876b43561a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403118/normal_5fc87aa50b40e.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/itll_be_alright_meaning.pdfIn PDF document text
    • http://zakixezurel.iblogger.org/specialized_sport_bike_computer_setup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487625/normal_5fd1129c61c41.pdfIn PDF document text
    • http://penafur.scienceontheweb.net/digaxufebumowovonobiji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415946/normal_5ff40e1eab59f.pdfIn PDF document text
    • http://parazepurafeza.medianewsonline.com/kutenanitokeranitomoz.pdfIn PDF document text
    • http://kumokopilomeme.22web.org/where_is_the_bat_emoji_on_android.pdfIn PDF document text
    • http://subuxiwubemew.getenjoyment.net/sinergia_definicion.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/9c597af6-c233-4d02-a49a-7f74feebfa1c/88300044917.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/lukizitumepabujedogoduz.pdfIn PDF document text
    • http://laruxikoxuvar.epizy.com/nofijuzixim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74534a4-4d7a-4be0-b9dc-54dacd54f8ae/honda_7000is_generator_cover.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51a5a888-d1ab-4c4a-940b-c214c23a8310/vejuraba.pdfIn PDF document text
    • https://s3.amazonaws.com/wolina/kabodeleriduja.pdfIn PDF document text
    • http://kipirigup.rf.gd/delukizo.pdfIn PDF document text
    • http://nabulegewuwal.myartsonline.com/40640218566.pdfIn PDF document text
    • http://gakinodimojulat.rf.gd/lyrics_of_seven_years_by_lukas_graham.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 5492 bytes
SHA-256: 9e8ae82e9c87721ecfe54bcda9afa3e1b2fe157b280ed4c046653b054afe7fa5
font_01_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 10968 bytes
SHA-256: 55438628ae22a95379c6f8d0358c89f0ca14dea7e8e83c43bc5cb70667d4720e
font_02_sfnt_off00012721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12721 16164 bytes
SHA-256: e296a61d2d303e35be9e1a35631556663d2780498efa7e8f3867bf557f172fe6