Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf54fe6d61a1206…

MALICIOUS

PDF

119.7 KB Created: 2021-05-02 20:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 53989d8fd51ed1f943e25414294df4f4 SHA-1: 1f50cf8c4975e9a6a3aa3a34ad0577d62c303393 SHA-256: 4cf54fe6d61a1206285209732fc421062aedaec3d2f9124f0e397152b3ca06d2
186 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. 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://jacksth.ru/strik?utm_term=how+do+i+know+if+my+keurig+is+2.0 PDF link annotation
    • https://cdn.sqhk.co/dukoredod/hfYghXh/cardboard_boxes_wholesale_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/zimajigon/hgjThix/45205074854.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/6796353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369315/normal_5ff954251b70c.pdfIn PDF document text
    • https://cdn.sqhk.co/xekowodu/hgEhdoM/calendario_biodinamico_2017.pdfIn PDF document text
    • http://copyrighthelpptteam.com/33354340664zo6rh.pdfIn PDF document text
    • https://bawozumop.weebly.com/uploads/1/3/1/4/131452782/ludezizifajoguledom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459319/normal_602da45d4c0a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467038/normal_5fc72c361b923.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449602/normal_5fdf8d8bd8481.pdfIn PDF document text
    • https://janirakuvofubej.weebly.com/uploads/1/3/4/7/134734148/setidamofekopamarofo.pdfIn PDF document text
    • https://mabelemaje.weebly.com/uploads/1/3/4/7/134705401/vasikupuju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410443/normal_6067efa183e2a.pdfIn PDF document text
    • http://bit7.top/21373893212x9hr9.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_4ad656e57172473190e1dd6bd401e2ad.pdf?index=trueIn PDF document text
    • https://cda84be5-0c54-4c05-8389-97bb004c798d.filesusr.com/ugd/fa9f00_e78c75fddec64337985f8571e40a13b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd12feec-cddc-448c-900d-ad7fc298759f/xbox_360_controller_disconnects_when_shooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e2d029-a008-49f5-9c04-1da4890822f8/jujaturaruxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4e0e580-0d1b-4697-999a-a2e40dd732ad/how_do_you_know_when_your_pocket_juice_is_fully_charged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15273ca9-521d-4d30-b189-30c7e2f338f3/83043877744.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00019337.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19337 20432 bytes
SHA-256: 94683835b2b2a2da66c906a4d16dfee8e3b369f4d173d18846254b47a98db8df
font_00_sfnt_off00015333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15333 5512 bytes
SHA-256: be7c7b15767e7ea130acea6a1a05a46c7d231f3c6fb7205eb82e9e259f21384f
font_01_sfnt_off0001660a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1660A 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off0001716d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1716D 9776 bytes
SHA-256: dc3e658acff3c43717df2813ae5437cfa0dad3c3575e3dc8e6659a550690d7a8