Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f071e172179ad30…

MALICIOUS

PDF

81.2 KB Created: 2021-05-19 05:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 7e26547367d54a9f6f9b1ed3ce4c95fa SHA-1: 734e1b33492f1426356bb1974acd2ae418e89ee8 SHA-256: 6f071e172179ad30f1791dd8bcaa1fb89a8887ffd2807b3adfabd7c2a1e03125
202 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary malicious URL identified as 'https://midufefew.ru/strik?utm_term=automatic+call+recorder+free+for+iphone'. Heuristics indicate this is a link farm and the ML classifier flagged it as malicious. The document body, though heavily obfuscated, contains text related to 'automatic call recorder free for iphone', suggesting a lure to trick users into clicking the malicious link. The presence of multiple external links and the ClamAV detection further support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://midufefew.ru/strik?utm_term=automatic+call+recorder+free+for+iphone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403819/normal_602f9958bb6fd.pdfIn PDF document text
    • https://nixujukasal.weebly.com/uploads/1/3/1/6/131636737/661087.pdfIn PDF document text
    • https://luruxelu.weebly.com/uploads/1/3/2/6/132682974/mosanawerib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_604d1e23f412a.pdfIn PDF document text
    • https://nojenekaxaxi.weebly.com/uploads/1/3/4/0/134017841/pibuvamilixatajutol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367296/normal_601c8bb47d1bd.pdfIn PDF document text
    • https://rexirarilabe.weebly.com/uploads/1/3/2/6/132681411/da0520dd03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424953/normal_601fcbb61072f.pdfIn PDF document text
    • https://deremorukoj.weebly.com/uploads/1/3/4/4/134490203/6d2eb11e4d1ef6e.pdfIn PDF document text
    • https://zavifojixu.weebly.com/uploads/1/3/3/9/133997579/xusoxin-zivakare-noxupefizaped-pexerubula.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/kiremefegonar/30831468714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e9ffdb2-ea17-43f3-b541-002812abbad7/kuziwuxudevaxogapase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25cf5ae9-14b1-47d4-b2b2-5b484f12939e/82457685367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25905d2d-2034-4635-8fad-6e6ae950ed37/why_have_my_bookmarks_disappeared_from_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/mokixetat/tipos_de_trastornos_alimentarios.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/nox_app_player_android_emulator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34b8b97-11e3-4584-a42a-a6d207009670/63041139781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ce1e782-9efc-4253-b9d9-fe7133d314f2/film_miley_cyrus_the_last_song_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/32362885317.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/sekidifimixatibesarebe.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_off0000ff3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3E 5204 bytes
SHA-256: 174d6097322f5904d2649540391e3356860f912da626efef0f1b5cda396ef303
font_01_sfnt_off000110c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C4 11900 bytes
SHA-256: 4aa40b95f98d4a7c5e82677cc747ae7a86e748fad946acd813e2f71a13b12508

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