Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ac949b11b4c03a…

MALICIOUS

PDF

81.6 KB Created: 2021-03-24 14:47:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fea4de511e1e90855149efdd9d71a472 SHA-1: 53402ceacb5207e77b9c11ae817721b5bc376cec SHA-256: 72ac949b11b4c03a0b2e774419a1d861d892c56d1b1537fe47561cef6400f744
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9957

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=how+to+use+nitecore+intellicharger+new+i4 PDF link annotation
    • http://lezapogogaz.iblogger.org/how_to_set_time_citizen_eco_drive_chronograph.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/maths_questions_for_class_7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_6016b328de698.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390637/normal_602c68092397a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476436/normal_5fe3a5235a306.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502817/normal_5fe7d4971d090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_603fe13d96c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384470/normal_6050f397959c2.pdfIn PDF document text
    • http://kosiwixiwumizu.iblogger.org/jedure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386848/normal_5fd158556c52e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427785/normal_605272347dcaf.pdfIn PDF document text
    • http://pizuwujigajanen.medianewsonline.com/calculus_and_analytic_geometry_george_thomas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc58184e-bbba-402a-8e08-a55d552c8f3f.filesusr.com/ugd/0ebc1f_07a29a340a7a4e1b8676fd9015e2661a.pdf?index=trueIn PDF document text
    • http://rojapaj.epizy.com/buxoxo.pdfIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_638299587048422da2ca1d9a08ed025d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/95828e5f-a7a5-4c04-b386-df41e9f9e882/98236755221.pdfIn PDF document text
    • http://befojarariwowab.epizy.com/xbox_one_controller_custom_shell.pdfIn PDF document text
    • http://relivoziz.atwebpages.com/cognitive_milestones_for_18_to_24_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb2470f-7c2f-4fe5-82cf-dcdc9fafb512/the_carrot_seed_activities_for_preschool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f85768-9181-47a2-b948-cde81009e4f2/how_to_run_diagnostic_test_on_samsung_dryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d42b2f4-0694-4b74-a10e-150bf5389089/mumokanawadilareguj.pdfIn PDF document text
    • http://bamakisubageto.epizy.com/adjectifs_possessifs_exercices_franais.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_587b3ef421d440fe939707df7482242f.pdf?index=trueIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_4f807d168a3542dd886f8415c005f4c3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b26bfee-ad5e-4910-88a9-601a7d569c65/15539309122.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_c88f461296764376b66a8a11a0e81909.pdf?index=trueIn PDF document text
    • http://memepev.myartsonline.com/robin_cormack_byzantine_art.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_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 5200 bytes
SHA-256: d49b23245e2e197c1b62f4d6df63301dafe2b751f83e9d0b72c048501ed67873
font_01_sfnt_off00010f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F48 11536 bytes
SHA-256: 8968d5da7980235486444c588fa15f56103647326febcaaa95cff3ffe9b2283c