Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56036cae8515820…

MALICIOUS

PDF

100.8 KB Created: 2021-03-27 23:56:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ae86c4b6d1ee81ffb9da46032985459d SHA-1: e9e8c2732b1a719645aa4be29426dd271edb4378 SHA-256: c56036cae85158205b6050c9a95ed006caaf8c20ea59898845f71249cb1e76bd
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to leverage external resources for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://resalured.ru/award?keyword=building+trust+in+a+relationship+pdf PDF link annotation
    • http://ponaxamewimenul.sportsontheweb.net/auriculotherapy_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/uQPijhi/atomos_ninja_v_battery_life.pdfIn PDF document text
    • http://bogplaktnc.fun/asta_sunt_eu_lidia_bublel7jqi.pdfIn PDF document text
    • http://autolombardpro.ru/how_to_hook_up_leg_pulley_on_total_gym34cln.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvidomanale/PjcyJgg/dinosaur_similar_to_triceratops.pdfIn PDF document text
    • https://cdn.sqhk.co/kikepedu/ftIihrb/21305593226.pdfIn PDF document text
    • https://wojodusu.weebly.com/uploads/1/3/2/8/132815854/7924366.pdfIn PDF document text
    • http://leadtop.co/harry_potter_movies_streaming_freeawblp.pdfIn PDF document text
    • https://cdn.sqhk.co/nosamese/r0LsQhc/league_of_stickman_2_sword_demon.pdfIn PDF document text
    • https://tekejixebosij.weebly.com/uploads/1/3/1/4/131452745/legita.pdfIn PDF document text
    • https://cdn.sqhk.co/dugixikisim/jiqQrV3/last_living_survivor_of_the_titanic.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/Addjiib/new_york_times_magazine_behind_the_cover.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/ihojjaw/first_week_of_kindergarten_teaching_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/8pygght/29408473281.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzosiboweja/8iahchf/kozakutonisagodukovizefus.pdfIn PDF document text
    • http://24goodstore.site/zedaxudolux1b1ht.pdfIn PDF document text
    • https://mitojebani.weebly.com/uploads/1/3/2/7/132711961/ae69b4779177.pdfIn PDF document text
    • http://purigoguwoz.22web.org/73684643814.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/ialgfii/memaditejojivowabe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://giduluterude.rf.gd/ginivera.pdfIn PDF document text
    • http://gamutazuzores.epizy.com/37789621873.pdfIn PDF document text
    • http://pofepopogako.rf.gd/hp_new_cartridge_price.pdfIn PDF document text
    • http://zogosugo.onlinewebshop.net/lunekawisofuxixamaxafari.pdfIn PDF document text
    • http://telimagafire.epizy.com/adjetivos_comparativos_en_espaol.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_off00014ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA9 5352 bytes
SHA-256: 4ac434cc039801be0f8990a110b245b7ad50dc79290279d13d307494ef1c975e
font_01_sfnt_off00015edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDB 11392 bytes
SHA-256: d61ea738382cd01d075d77f179fcf6b4f2a22d6b16c75e7f3d370c0ed0eab75f