Malicious PDF — malware analysis report

Static analysis result for SHA-256 208b138992525094…

MALICIOUS

PDF

78.9 KB Created: 2021-03-25 07:51:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: cf878ff55421ba09861fdb6789947043 SHA-1: a1f01962bf4fff43468dbf9b4c6e56d61cc7ee7b SHA-256: 208b138992525094be2017eb729af459b13ecc59ec5d0a559b9367c275f341f9
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as a phishing trojan. The embedded content, though heavily obfuscated, appears to be related to financial trading platforms, suggesting a phishing lure.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=thinkorswim+web+based+paper+money+login In PDF document text
    • https://riragojefo.weebly.com/uploads/1/3/1/8/131857115/458904f4.pdfIn PDF document text
    • https://xujebope.weebly.com/uploads/1/3/4/0/134018561/kaneluroxefek.pdfIn PDF document text
    • https://cdn.sqhk.co/dawadetugas/YgfWThf/repost_app_not_showing_caption.pdfIn PDF document text
    • https://dudasajaje.weebly.com/uploads/1/3/4/3/134362454/9164613.pdfIn PDF document text
    • https://najafisexu.weebly.com/uploads/1/3/5/3/135330693/vanolasumuz-zawudabom.pdfIn PDF document text
    • http://gta-msk.ru/8105263710701iom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_6050b8eebba7c.pdfIn PDF document text
    • https://cdn.sqhk.co/gozigawefo/jydggjg/45128040503.pdfIn PDF document text
    • https://zosomezo.weebly.com/uploads/1/3/0/9/130969149/sirudifulakida-rizana-dusigigupu-tusojuzivur.pdfIn PDF document text
    • https://vibisorimujeke.weebly.com/uploads/1/3/4/3/134344086/a10952b600d6.pdfIn PDF document text
    • http://lnstagram-verifedbadge.com/6303210465930r7g.pdfIn PDF document text
    • https://cdn.sqhk.co/podizapexiv/he5ibAl/7765436975.pdfIn PDF document text
    • https://zejebamusij.weebly.com/uploads/1/3/2/3/132302936/tilitu-desufewogu-xoxesizewev.pdfIn PDF document text
    • http://kyhni.site/pogiduxiridorivixuf0v9y.pdfIn PDF document text
    • http://salet.store/los_cinco_lenguajes_del_amor_libro_completolog8r.pdfIn PDF document text
    • http://wexasodujilil.22web.org/8546627293.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448339/normal_60471514bb498.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/jerudozuzinijetiru.pdfIn PDF document text
    • https://joletumutete.weebly.com/uploads/1/3/4/8/134871701/2418853.pdfIn PDF document text
    • http://kotumixevana.22web.org/vifutuzu.pdfIn PDF document text
    • http://lidzadva.xyz/10859756369ih0fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisigivikevutik.rf.gd/percy_jackson__the_olympians_the_lightning_thief_review.pdfIn PDF document text
    • http://fasilew.epizy.com/best_typing_software_for_pc_free.pdfIn PDF document text
    • http://magajavopisili.epizy.com/5113496586.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_off0000f52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52B 5720 bytes
SHA-256: 38a515095d883f535ebd9ec1bbd099e699babb298574523691c4354231819c07
font_01_sfnt_off00010884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10884 11076 bytes
SHA-256: 3a180d6370444057308cb0a23b342c92353de2e7a77619d729f216c58ae9fc17