Malicious PDF — malware analysis report

Static analysis result for SHA-256 9337b76029cdb78e…

MALICIOUS

PDF

86.6 KB Created: 2021-03-18 21:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 439689efca5032ecb0c94acb385193c7 SHA-1: 56409b823c8c4bb880a6936719d9fc3ea65ac1b5 SHA-256: 9337b76029cdb78eec1655445c632a3c0a0d2c637bcae7bbfd6b79390cae9f17
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 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/award?keyword=algebra+1+problems+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402000/normal_602effbe40d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419002/normal_6036fca715879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490122/normal_604e36e6db79a.pdfIn PDF document text
    • http://xetorobexojukas.22web.org/87026198567.pdfIn PDF document text
    • http://gudibetujem.iblogger.org/lifofak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493867/normal_60244f28a1ae2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478655/normal_6030187acc357.pdfIn PDF document text
    • http://viputixezererej.66ghz.com/sample_frequently_asked_questions_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5fee875fed6d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426267/normal_5fce190349bde.pdfIn PDF document text
    • http://panokaluwavivar.iblogger.org/o_come_to_the_altar_sheet_music_g.pdfIn PDF document text
    • http://suzenax.22web.org/20724702619.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_603092ab3bacb.pdfIn PDF document text
    • http://zakazemakeda.22web.org/jejusimufumavapuvaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_6042e6cc8ec33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://deketinak.rf.gd/40900359891.pdfIn PDF document text
    • https://a2214900-82f6-4ed5-a432-d5ffd14110fa.filesusr.com/ugd/306b6b_0166b690af9746d6a5e2c5e1b39c5d8f.pdf?index=trueIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_4987df7cacf24bc49d556c1883fb16d8.pdf?index=trueIn PDF document text
    • http://zoxirebetezeguz.epizy.com/chemistry_notes_for_neet_exam.pdfIn PDF document text
    • http://gunodigibuf.epizy.com/champagne_in_the_heights_sheet_music.pdfIn PDF document text
    • http://zasedemo.rf.gd/what_does_it_mean_to_be_pimping_out.pdfIn PDF document text
    • http://namajoveteri.epizy.com/how_to_push_a_piston_with_a_piston.pdfIn PDF document text
    • http://xonesopidazuju.epizy.com/42667165705.pdfIn PDF document text
    • http://jokiperone.epizy.com/ap_stylebook_2018_free.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_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 5540 bytes
SHA-256: 9e7c2ff124ada0422c520f4926db7567d433d832a1c9ff04825c11123bfcae20
font_01_sfnt_off00012297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12297 12064 bytes
SHA-256: e6ab39da8529a13b5fe90d51f67c700465969529be4c73fa6c7074f5b751846c

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