Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb8b9e25029b5d1…

MALICIOUS

PDF

66.8 KB Created: 2021-03-07 14:42:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d12c10b168a6fe4af21a36fe9de6a253 SHA-1: c86f7c8ff8ab5bd5e9f3d10a862807afe2e7f5b0 SHA-256: 3cb8b9e25029b5d1a6e261d3a7311ea8120c2a4ac87b0299c3b17b624c990354
184 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicative of a link farm or SEO poisoning attack. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL and the document body's superficial content suggest a pretext to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • 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
  • 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://resalured.ru/award?keyword=how+do+you+oil+a+grandfather+clock PDF link annotation
    • https://cdn.sqhk.co/rewakevutel/gf6gyib/xumexuzukuloximadezidufak.pdfIn PDF document text
    • http://jenupekob.iblogger.org/bandit_eye_mask_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471971/normal_602d833c8f273.pdfIn PDF document text
    • http://nomokosu.iblogger.org/xovikiluvalodonodubevulex.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/bhfidaU/light_bike_io_2_apk.pdfIn PDF document text
    • http://sarepoxorak.22web.org/11451729412.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_60197697254e5.pdfIn PDF document text
    • http://tedujutof.iblogger.org/what_are_the_top_10_states_for_human_trafficking.pdfIn PDF document text
    • https://cdn.sqhk.co/mekibekowufe/bjdpijm/bangla_to_english_translator_software_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/Vgd2ifj/tap_tip_top.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://robabunegulawi.rf.gd/how_to_share_photos_on_facebook_with_selected_friends.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54be26fc-2268-421d-b441-4da36514d7bb/how_to_add_references_in_word_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42fdd074-4bfd-4f7e-ae98-f99f9e8cd901/bojidafevuviropuwiroxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/819d304c-7d76-4de3-83d4-72c0e81fff80/basic_elements_of_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51b4ce65-4aae-4bce-baec-653a78818b7c/18985804273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfc23593-4cb5-4e37-b441-ee3778ab4a24/bugetudatusuxijerer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d4cc542-d81b-4d38-a236-4997f54457f5/navopuselevawiso.pdfIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_e5aebe1fdb1a44ca8ad8dec1e18c0e7c.pdf?index=trueIn PDF document text
    • https://95e354e6-8561-4e52-807b-deb85f3b5fdd.filesusr.com/ugd/ca9b0a_e8390d1bce854d63ac25554947a287e0.pdf?index=trueIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72B 5324 bytes
SHA-256: 98788476b2e365344d8de87fe01af6054db17b4f96dcdeb95d9c7feb5a2ea2a7