Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd1794b5d1332d1…

MALICIOUS

PDF

75.0 KB Created: 2021-03-11 00:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9c596dd8ad30b2a916287b0ada6ff364 SHA-1: 1be9532113005fa17be0ef7e09de02e780a8a18c SHA-256: 7bd1794b5d1332d13612d585ed995096622a0302ffd8915293c285a725a202d7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to host phishing or malware distribution sites. The document body, though heavily obfuscated, suggests a lure related to 'calculus and analytic geometry pdf notes', aiming to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/award?keyword=calculus+and+analytic+geometry+pdf+notes PDF link annotation
    • http://rulabepotinujeb.mypressonline.com/23483076641.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/xivezajovafowixivoxozoj.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/what_is_the_default_ip_address_for_arris_router.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/balancing_chemical_equations_practice_class_8.pdfIn PDF document text
    • https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/85898ce7d67.pdfIn PDF document text
    • http://salonhq.xyz/how_to_prevent_leaf_footed_bugslkiib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494139/normal_6000dda9df514.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/canada_food_guide_removes_milkkdt0i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5ffcd03a66d31.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375341/normal_5ff1fab50a5c4.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/94882415769.pdfIn PDF document text
    • http://getallcreditscores.info/retajemodukupur7n9f.pdfIn PDF document text
    • http://my-favshopg.online/how_to_use_tappan_self_cleaning_oven0pl2g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5fd36cc9e3435.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/1959040.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/jerusutusolipebipagule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484820/normal_5ff81a511d7bb.pdfIn PDF document text
    • https://gakokoxexoboj.weebly.com/uploads/1/3/0/7/130776672/jadomev.pdfIn PDF document text
    • http://lnstagramverifiedsbadgeform.com/56002879691xnowo.pdfIn PDF document text
    • http://meinekarten.best/jebijemisafofifipidzyp3z.pdfIn PDF document text
    • http://idealslimitaly.site/sumijitowosepyibn3.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/5613807.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pogetowem.onlinewebshop.net/how_to_reset_motorola_xt1921-2.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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 5484 bytes
SHA-256: d775dd0bf4c83bce55bdb0746f0c53c0a0fb20d203d7703d273762d2816d0d86
font_01_sfnt_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 11192 bytes
SHA-256: 15a0d4a88511056256d09154054176309250ce86f19f87a1289fefdeedb6c6af

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