Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfd301db1fd27b4…

MALICIOUS

PDF

81.4 KB Created: 2021-03-27 11:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 5917050d9dc0b18f08b2b981b340acf4 SHA-1: 9d070c390e626287bc2ada198bb75d3cf3163792 SHA-256: 7bfd301db1fd27b4f56f0cbbb113bc2386af86b12b72f43af2069fc6e70bec89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' pointing to a large number of external PDFs. The primary URL, 'https://ponafet.ru/award?keyword=similar+triangles+pdf+worksheet', suggests a lure related to educational content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • 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://ponafet.ru/award?keyword=similar+triangles+pdf+worksheet PDF link annotation
    • https://radefikifuru.weebly.com/uploads/1/3/4/7/134723330/eee934382c2ece8.pdfIn PDF document text
    • http://sarawavenudiwap.mygamesonline.org/29354941127.pdfIn PDF document text
    • http://depusapo.mypressonline.com/82747562073.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/3496988.pdfIn PDF document text
    • https://tawusizigegik.weebly.com/uploads/1/3/3/9/133997505/5dcd3a58c16b2.pdfIn PDF document text
    • https://jarosebat.weebly.com/uploads/1/3/4/6/134695718/b6c2701.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zodawanuror/75580715680.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/agricolae_r_package.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/mini_cooper_s_manual.pdfIn PDF document text
    • http://padenijuwike.rf.gd/lokalebezazez.pdfIn PDF document text
    • http://rixexoto.rf.gd/20025924100.pdfIn PDF document text
    • http://likasuretaw.onlinewebshop.net/61112452256.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/batis_aramin_room_rates_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/245cc173-ab76-43c4-9661-73de90350148/19577389255.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352543cc-7c39-419e-92be-ed2b5de68464/why_am_i_bad_at_basic_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8926d5-7fcf-4da1-aaa9-94556b293ce0/jetuxibewagorigit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ceeaf33-0775-4471-b3ed-11136e6e716d/86673805456.pdfIn PDF document text
    • http://fatapiwav.rf.gd/doing_business_in_vietnam_a_cultural_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/bingo_colours_printable_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/708c3089-5696-4c87-8d91-f414d1b86482/fapatotepebolen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b07a2761-ff69-4602-b713-17a66cf13660/10_ejemplos_de_medios_de_transporte_terrestre.pdfIn PDF document text
    • http://joxuritodapeni.epizy.com/78736738877.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54f3b8c3-787e-47ef-ab86-047a3e5b4ffb/convertir_fracciones_de_pulgadas_a_milimetros_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a99dfbbb-fb44-45bb-a4d5-096775bc8f68/what_is_a_6_month_tenancy_agreement.pdfIn PDF document text
    • http://fedonefekipide.myartsonline.com/mebawopubena.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 5504 bytes
SHA-256: ba4e4e5bc37b746b8c6563baa07973e0e967e2a393f78120c8b68c34031f7614
font_01_sfnt_off00010610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10610 10308 bytes
SHA-256: 3834c7af6200b148234f0027f5e7e91c7271453bb4b0c1d20c6fb28601a6d659
font_02_sfnt_off0001295a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c