Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f24173e0d10b6e…

MALICIOUS

PDF

81.1 KB Created: 2021-03-11 22:28:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad564fa2196ab4ff6270bdd586a410c1 SHA-1: 094ffcc99263d8f2696f282204816a8c171685ac SHA-256: c3f24173e0d10b6ef834480f50e164a2922e559bfcbc37983f12b681196f0f88
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 0.9990

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://nipisod.ru/123?utm_term=cpr+latest+guidelines+2017+pdf PDF link annotation
    • https://buwulikifem.weebly.com/uploads/1/3/4/5/134583505/467a5f5b84.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/xabovubop.pdfIn PDF document text
    • http://kaxazul.iblogger.org/71241610230.pdfIn PDF document text
    • https://wetololat.weebly.com/uploads/1/3/4/7/134710700/radixoliredu_piwakojotakuz_kebopagizur.pdfIn PDF document text
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/kokagerubajurata.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/papagupujirom.pdfIn PDF document text
    • https://mebavowu.weebly.com/uploads/1/3/4/3/134353315/fuximulazewadagupure.pdfIn PDF document text
    • http://kulefinimujaleg.iblogger.org/carers_allowance_online_form.pdfIn PDF document text
    • https://mutolumikiwow.weebly.com/uploads/1/3/1/8/131872082/gilulufiwuzuri.pdfIn PDF document text
    • https://kelutatu.weebly.com/uploads/1/3/4/5/134521402/kefasopegelumetif.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/ranawivadikasixido.pdfIn PDF document text
    • https://pebepatesova.weebly.com/uploads/1/3/4/4/134447190/fawemekix_kebasitafedo_fewasuxadi_zepodevat.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://uploads.strikinglycdn.com/files/6646820c-734d-44bd-af61-55258fcbb954/31187166755.pdfIn PDF document text
    • http://zovuzizosagedip.epizy.com/69734004392.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/heenan_lake_fishing_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/dozuga/english_speaking_fluency_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/31012351983.pdfIn PDF document text
    • http://zararogesa.epizy.com/15513517741.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b10731-02cd-4cf1-a7f0-3a2a7644dfcb/how_to_set_g_shock_gd_100.pdfIn PDF document text
    • http://nofifejagarenut.epizy.com/lohengrin_bridal_chorus.pdfIn PDF document text
    • http://padunogesabe.rf.gd/basic_english_grammar_book_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7ec36d-2c9a-46de-99dc-02520eaac36a/phonetic_alphabet_print_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/298a42ca-8432-4579-bc45-2dee94730b2a/61134363940.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/72162072609.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_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 5412 bytes
SHA-256: 615436803b70dff952a46efac5d00c5f96e0f78983e0841331586d50fc542f86
font_01_sfnt_off0001023f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023F 11460 bytes
SHA-256: df81481ebb3b2029ab4735da85cd367c7a2acd3a88b5c171f371b46a92c5844e
font_02_sfnt_off000128d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3