Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbceac933f1aac93…

MALICIOUS

PDF

83.4 KB Created: 2021-02-10 08:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5e54cefdbbfcc7218bc1e3c3fc90c467 SHA-1: 6bb49e6df03af069953c7e11504d06cf94456866 SHA-256: bbceac933f1aac935246b629ccc86613d7dd829138256fd6460936f240cdebdb
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 0.9996

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 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://leonvi.ru/aws?utm_term=t+c+s+ki+full+form PDF link annotation
    • https://galixasuja.weebly.com/uploads/1/3/4/5/134518214/bodalulanipobel.pdfIn PDF document text
    • http://on-arenas.com/20245226742u0smz.pdfIn PDF document text
    • https://vuxutuwatojo.weebly.com/uploads/1/3/4/6/134625262/0432d501213.pdfIn PDF document text
    • https://cdn.sqhk.co/bisegepamitu/gdesrRt/wepabawavasizavibotuz.pdfIn PDF document text
    • https://latiniwujuxemuw.weebly.com/uploads/1/3/3/9/133997677/4768313.pdfIn PDF document text
    • https://cdn.sqhk.co/virawamimozi/dggXjfT/13412864497.pdfIn PDF document text
    • https://gopaxabog.weebly.com/uploads/1/3/5/3/135309926/3675442.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/tavakudibiwum.pdfIn PDF document text
    • http://dayzcommunity.info/791179291959waki.pdfIn PDF document text
    • http://afracheat7.xyz/966106955370mv1e.pdfIn PDF document text
    • https://tadivibudup.weebly.com/uploads/1/3/4/8/134899420/6131297.pdfIn PDF document text
    • https://bemisawu.weebly.com/uploads/1/3/4/7/134716701/damuvafopulata-xuxepipusa-wafuvuvakorug.pdfIn PDF document text
    • https://cdn.sqhk.co/pumopivosoba/vgg2Hzm/electricity_bill_check_online_cg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://gemuviwir.rf.gd/november_2017_printable_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/mugupi.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/picsart_pro_apk_happymod.pdfIn PDF document text
    • https://s3.amazonaws.com/dukexajuj/47311520368.pdfIn PDF document text
    • http://matunojusorim.epizy.com/rubber_sheets_for_bed_walmart.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
font_00_sfnt_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 4828 bytes
SHA-256: b5c9f466200037850402226f2813b0288570abae95fc5f6a2242f1f50d327155
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off0001045d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045D 10996 bytes
SHA-256: 499468a3d50b9a6486917f7e6b7c2248e16005a3fa0a65dafe32724863a2e2a7
font_03_sfnt_off00012a2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2D 6444 bytes
SHA-256: 5cd11635a5c35af96fe270cc0ca61e64a7dd943b577ae6d49245b4c39559b850

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