Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1f335be7deac878…

MALICIOUS

PDF

75.0 KB Created: 2021-03-03 18:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5441448f5805bb3bc7892452684ef436 SHA-1: b5692a85f3517e1420e6bf9655616efb002c15b0 SHA-256: a1f335be7deac878fa67e00473097e3d2626cb5c002948c80d56757269af381d
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, with one pointing to 'jacksth.ru', suggesting it functions as a lure to external malicious sites. The presence of embedded URLs and the PDF structure strongly suggest it's part of a phishing or malware distribution campaign.

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/aws?utm_term=summertime+real+book+chords PDF link annotation
    • http://dotenipago.medianewsonline.com/53555034050.pdfIn PDF document text
    • http://btsworld.org/36495509360eddyz.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/viking_hot_tubs_reviews.pdfIn PDF document text
    • http://expressday.online/97984244881u7z3w.pdfIn PDF document text
    • http://o-karte-kopilka.com/pisusinopetomoruzapedizinzmqd7.pdfIn PDF document text
    • http://larebalin.mypressonline.com/can_i_get_a_covid_test_in_georgia.pdfIn PDF document text
    • https://minojesifivu.weebly.com/uploads/1/3/4/8/134860027/sitejotoroku-gunog.pdfIn PDF document text
    • http://peludofnor.fun/xolutewawiwenu70hwl.pdfIn PDF document text
    • https://zewijevatijafat.weebly.com/uploads/1/3/4/2/134265582/4b0ff0d3c406.pdfIn PDF document text
    • https://vavaterojitenoj.weebly.com/uploads/1/3/4/8/134898986/4d0f0c08c.pdfIn PDF document text
    • https://lujukote.weebly.com/uploads/1/3/2/7/132712447/luripusapipi-sisujotizepunol-keregesa-wisivepif.pdfIn PDF document text
    • https://getesedalo.weebly.com/uploads/1/3/4/6/134629657/1709370.pdfIn PDF document text
    • http://alluniversity.fun/manual_de_procedimientos_ejemplos_cortosr2fyb.pdfIn PDF document text
    • http://cmb-eco.com/43376923363yx9ku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://betemeparax.rf.gd/97148982753.pdfIn PDF document text
    • http://bolozenafo.rf.gd/sebapewuweba.pdfIn PDF document text
    • http://vakakumiwizexoj.epizy.com/87130848111.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE653 5488 bytes
SHA-256: 9236c22dd5696339b5b2254dc7733b57376a9f94fc6bae4a2c94b5699450120e
font_01_sfnt_off0000f8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 11120 bytes
SHA-256: ff85e85aa5b195097fb66839d4abc2f916894ae9e03151714604c068b6bc5651

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