Malicious PDF — malware analysis report

Static analysis result for SHA-256 644954c177c490f4…

MALICIOUS

PDF

81.4 KB Created: 2021-02-24 02:55:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2616563129ac5befbcb16db623c84067 SHA-1: d0345772db0115ddb695c78ac84bfea042507744 SHA-256: 644954c177c490f484a325fac2dcbd2a5310e1d8c0e807652e6129ba64332f71
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, with a primary external URI pointing to 'jacksth.ru', suggesting a redirection to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious intent by indicating the PDF is part of a link farm on disposable hosting. Although no scripts were explicitly extracted, the PDF structure itself likely contains embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jacksth.ru/123?utm_term=agentes+secretos+y+el+mural+de+picasso+characters PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410462/normal_6013b61a0e47b.pdfIn PDF document text
    • https://rufogeror.weebly.com/uploads/1/3/4/6/134664275/fefewobekuji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_600512a26d5d9.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/4zY1gey/35323315380.pdfIn PDF document text
    • https://cdn.sqhk.co/tilafukefuwe/ibe8gcl/the_rotten_aftermath_rescue_the_survivors.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468255/normal_5ff3a7c53979c.pdfIn PDF document text
    • https://gitapelo.weebly.com/uploads/1/3/2/6/132682700/rajoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379385/normal_602574f67e628.pdfIn PDF document text
    • https://gukofatupov.weebly.com/uploads/1/3/1/0/131070505/4099869.pdfIn PDF document text
    • http://tukudetu.iblogger.org/kafov.pdfIn PDF document text
    • https://cdn.sqhk.co/sabepakofo/hhsbVgi/beat_swiper_godzilla.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_60180b307b355.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
    • http://jegovogetaferop.epizy.com/types_of_formal_letters_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/nusukenofupixogigi.pdfIn PDF document text
    • http://fuzadakeju.epizy.com/divabujobafodeboxubi.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 5460 bytes
SHA-256: 2540b9bf092ee3489db790b551787683bd2fc7ea128d2066154b72fcbf876404
font_01_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 14132 bytes
SHA-256: 66212ee9bc5d5990ae3abc070c0fd2c5a3bc7e7c4bd11f2d3efad491b64829ba
font_02_sfnt_off00012837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12837 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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