Malicious PDF — malware analysis report

Static analysis result for SHA-256 c422ced8c520b910…

MALICIOUS

PDF

80.6 KB Created: 2021-03-16 11:16:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 67f4b053551150a87bcfa92f32898e0f SHA-1: 8f1eb386323e490b77db135f4b2dcd4959715c2a SHA-256: c422ced8c520b91053e5c0eefe3eb1474f76f152a8bc6c9c71f06308655fee4b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://xajibur.ru/wix?keyword=mapp+and+lucia+episode+guide PDF link annotation
    • http://wukifiduputafeb.22web.org/how_do_i_pair_a_ge_z_wave_switch.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490141/normal_5ff36ef8b95c2.pdfIn PDF document text
    • https://cdn.sqhk.co/sinemajud/giJSkia/ligabaduj.pdfIn PDF document text
    • https://bobiguwifuza.weebly.com/uploads/1/3/5/9/135966914/ziwexifamimabuxosa.pdfIn PDF document text
    • http://jetanevuv.iblogger.org/administrative_management_theory.pdfIn PDF document text
    • https://godobinoka.weebly.com/uploads/1/3/0/8/130815080/buwikuxaz-lozanegob.pdfIn PDF document text
    • https://cdn.sqhk.co/toxotunem/dicqvhf/angiographic_guidewire_medtronic.pdfIn PDF document text
    • https://muzuwetabez.weebly.com/uploads/1/3/1/4/131483468/6487412.pdfIn PDF document text
    • https://junowebabozem.weebly.com/uploads/1/3/5/9/135965754/wowixilojesilet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379049/normal_6019b0f177b9f.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/iiaiehi/big_baby_tape_gucci_genius.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0390e189-acc4-4ba1-ae24-e0acc7a02f5c/primeros_auxilios_para_un_nio_que_se_ahoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4988cee3-79e1-408e-a20f-8b6c6b91f096/6119691605.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0c0914a-149a-483f-9038-c5459cbe351f/rovanop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81469f94-4c0f-4436-a2d6-c556878ed5f9/dofewexabuti.pdfIn PDF document text
    • http://bepapogijarepub.rf.gd/are_dividends_taxable_when_declared_or_paid.pdfIn PDF document text
    • http://xibunagevidaze.rf.gd/artemis_fowl_the_last_guardian_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae0859c-4e68-4c5d-8026-d9108243ba1b/jvc_model_number_sx-pro_32.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e257605-4441-4951-94f7-4bf109b699bf/how_to_study_for_usmle_step_1_old_img.pdfIn PDF document text
    • http://xokofenox.epizy.com/state_fair_coloring_sheets.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_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 5148 bytes
SHA-256: 0f5433e2e0bf1cc57a1b6e466d82d5f9804e292fc51ab65e20e49454f58e0776
font_01_sfnt_off00010e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 11716 bytes
SHA-256: f14eef66acd1f0c8148795653661b2f6e30be2e44c93741928cf594a82473cea

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