Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88b1fe4ecb0b593…

MALICIOUS

PDF

75.4 KB Created: 2021-03-02 12:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0aff5dcc68b107865a993c1786c73f71 SHA-1: 878d0f13b188bd9b7784d47518955001ad4a333e SHA-256: f88b1fe4ecb0b59331ae5396ae776e9c290ace67a8953d5dd729a25c1ebaa267
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains or link farms, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=best+alternative+to+ms+project+for+mac PDF link annotation
    • https://cdn.sqhk.co/vuzefegevo/gglhgjc/3827309339.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/mpmb_spell_sheet_generator.pdfIn PDF document text
    • http://huaweistoreukr.xyz/kugasamotedevixuvawamefufqzy2e.pdfIn PDF document text
    • https://kexanitafax.weebly.com/uploads/1/3/0/8/130813084/zazonole.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/50518729800abbik.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/kZjazn8/rutid.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/iij025t/48553626241.pdfIn PDF document text
    • https://cdn.sqhk.co/kepebeso/bhaLC1i/youtube_musica_italiana_hit_del_momento.pdfIn PDF document text
    • http://barashik.space/146806557798p0k2.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/idvZgcm/20229789839.pdfIn PDF document text
    • https://zofifonanofanap.weebly.com/uploads/1/3/4/8/134876640/rirojilukejuj-wokofijire.pdfIn PDF document text
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/81475f991.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/86693435725.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/Lg6jaSX/xopawinezebaxufozaj.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/ajaVkhd/how_to_repost_instagram_stories_on_android.pdfIn PDF document text
    • https://cdn.sqhk.co/furaxofir/jidGhfP/costume_ideas_for_couples_scary.pdfIn PDF document text
    • http://mazikopipovix.mywebcommunity.org/dia_de_la_madre_mexico_fecha.pdfIn PDF document text
    • https://guxanavos.weebly.com/uploads/1/3/4/2/134235011/nolufeke_gulawefokabofe_novowamidiko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fajixe/bootstrap_navbar_examples_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/most_bioavailable_form_of_calcium_supplement.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/99692602530.pdfIn PDF document text
    • http://kubowulurarekij.myartsonline.com/nalunuvoxetisaw.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_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 5348 bytes
SHA-256: 4da9e96e6cc985bfcca8fda931fe5abd9cc54914da7c17fb944e70a1b59c9324
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10120 bytes
SHA-256: f66f5b7b011b8bc0bd0dad6d90258f24ec6286662376fd287b065c7f6e1dbbb6