Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cb913a7fff831b…

MALICIOUS

PDF

82.2 KB Created: 2021-06-11 02:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a0e8d48a59a92d921e19cee5f0184898 SHA-1: 6e27cf41f0ea346ac5fc4f1a150321e8f09136b1 SHA-256: 49cb913a7fff831b0a58eb7b4d7aa968b19bf647fe389d81159ec2860460cf40
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-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://queure.ru/pbw?utm_term=imu+gy+80+datasheet+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403680/normal_6045ff256490a.pdfIn PDF document text
    • https://jurutidi.weebly.com/uploads/1/3/5/3/135397820/73db497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444877/normal_6011c25f0becc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412379/normal_6026b30a14e74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403679/normal_5ffa7217a6326.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_6038c5ae02793.pdfIn PDF document text
    • https://solejibanumiro.weebly.com/uploads/1/3/4/4/134489880/1051297.pdfIn PDF document text
    • https://xomadugazulu.weebly.com/uploads/1/3/4/5/134597447/timogufa-libop-werilovigizisa.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4502464/normal_60b41cb6d971e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382614/normal_5fe3220b77b25.pdfIn PDF document text
    • https://vifiboreb.weebly.com/uploads/1/3/5/3/135349596/fofur-libasitulorime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_60633547d051a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421207/normal_5fd9e3f49317d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450732/normal_604886811f16f.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/a77ef091-81a9-4ce4-8620-d909eaf25a70/bugapefut.pdfIn PDF document text
    • http://metudebebi.pbworks.com/f/ifrs_9_off_balance_sheet_items.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7ea0de-86ee-41f6-93b9-e964f22c3dc5/agnes_of_god_john_pielmeier_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fa247f7-f684-4c8e-8aeb-e08a1f38550e/scratch.mit.edu_duck_song.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/145089765/explore_file_manager_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30232a36-2ece-4f69-b8df-bc86b0a92db8/cuisinart_toa-60bks_convection_toaster_oven_air_fryer_with_light_black.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_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 5700 bytes
SHA-256: ca400537b11dd82b10abe4ab7beffa17daa8a7d660ce4172f488c52f15fd886b
font_01_sfnt_off00011131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11131 12684 bytes
SHA-256: b9ae924979bfe95f80fca5728911f70564afd73c7e8b61687f1947a2b2897a04

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