Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef061714f9665e1…

MALICIOUS

PDF

96.1 KB Created: 2021-03-22 06:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7ca32a75f9508e1d6ac38845e4b67199 SHA-1: a7eec18d7b2a118af20292e872675893ad28ffd5 SHA-256: 4ef061714f9665e1346db3c421df6f1fdf1f84907c24ed7e0abd740aeb1c2d6d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. 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 0.9996

Heuristics 7

  • 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
  • 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://xajibur.ru/award?keyword=anthracnose+of+guava+pdf PDF link annotation
    • http://lepavojag.22web.org/vuwaruzed.pdfIn PDF document text
    • https://tozafutesaf.weebly.com/uploads/1/3/4/9/134900259/ef13fee.pdfIn PDF document text
    • https://meripowubizaj.weebly.com/uploads/1/3/5/9/135959363/mekikadimabadux.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/4278604.pdfIn PDF document text
    • https://kirasupi.weebly.com/uploads/1/3/4/4/134442552/fonusiki.pdfIn PDF document text
    • https://soremezu.weebly.com/uploads/1/3/1/0/131070226/99c5d0c4be3ed5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_5fd16132dffdc.pdfIn PDF document text
    • https://bimuwosexiwo.weebly.com/uploads/1/3/1/1/131164043/687092756c0.pdfIn PDF document text
    • https://pupowoxixibigi.weebly.com/uploads/1/3/1/4/131438439/359158a5178d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5fe75199acb8c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ledojiwibobuva.rf.gd/15229251869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/591d2919-e02b-4057-bd18-2d2457f644fc/14865368862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0066a2-6656-459d-aad0-0da3e1a3ba28/56765990289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5ac5a96-6489-4d86-8049-7e15c3655e38/what_size_needle_should_i_use_for_insulin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253505e2-d1cf-46b4-8163-d9d4cdda9b5e/85670176519.pdfIn PDF document text
    • http://wutogiku.epizy.com/mejinuduselip.pdfIn PDF document text
    • http://zukalovuno.rf.gd/korogozatit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/649334d5-e2f0-4062-af84-dd17a829bd4a/panasonic_tc-p42x3_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbc52e21-3eb3-4cf2-9c0b-17b6eb767ee9/9192732281.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e13ef3a-ccc0-4f49-a3dd-6ee58a8195da/graco_double_stroller_uno_to_duo.pdfIn PDF document text
    • http://gelutosedufom.epizy.com/the_fire_sermon_eliot_riassunto.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_off00012209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12209 5436 bytes
SHA-256: cc85ecbea77f1b4fe0c02514efca632ea19d05678da3af0cd6c2d99e72dc86fe
font_01_sfnt_off00013488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13488 11540 bytes
SHA-256: f23896aa221d9b2d92d743b5480ef143e51b7ad4b47cf893efce5354b2ffa482
font_02_sfnt_off00015bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BFF 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15