Malicious PDF — malware analysis report

Static analysis result for SHA-256 978a22c88fdb280e…

MALICIOUS

PDF

75.8 KB Created: 2021-02-18 13:14:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8f54cc117f1de1e6bcb1ef37564f07ff SHA-1: 12266159f831ef2cb438b7bc398fe56cfe9ce730 SHA-256: 978a22c88fdb280eeec6cad0ed307b636cae2d2e0b0a635f1d30c3bdf40dfde9
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially harmful content. The presence of an embedded URL and the heuristic 'PDF_SEO_LINK_FARM' indicate that the document's primary purpose is to drive traffic to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=commas+worksheet+high+school PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415543/normal_601763e1e8657.pdfIn PDF document text
    • https://tivifetanesa.weebly.com/uploads/1/3/5/3/135347176/vamuvif.pdfIn PDF document text
    • https://gororumemi.weebly.com/uploads/1/3/4/5/134517819/3532090.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470982/normal_600b0276af590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405437/normal_60277358cd661.pdfIn PDF document text
    • https://narodejezagog.weebly.com/uploads/1/3/3/9/133988416/024dc302fd.pdfIn PDF document text
    • https://jigebizelu.weebly.com/uploads/1/3/1/4/131438259/zoruv_zotewekinoxa_bolakagukasatu_penobos.pdfIn PDF document text
    • http://getallcreditscores.info/otras_maneras_de_usar_la_bocamo9if.pdfIn PDF document text
    • http://xisajole.iblogger.org/dudarumalabizukamam.pdfIn PDF document text
    • http://mangalvpodarok.ru/bafore6r3pm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381320/normal_5fd6e2c722662.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369657/normal_6021f494a41a2.pdfIn PDF document text
    • https://sezitekiporav.weebly.com/uploads/1/3/4/6/134627959/1e7abdbaa15.pdfIn PDF document text
    • http://albatros-trans.ru/ziwebobazuwimasigugoxorea45rh.pdfIn PDF document text
    • https://wavinibavuma.weebly.com/uploads/1/3/1/3/131398010/kegokupujutixepi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vabanenutulaki.rf.gd/facebook_banner_template_photoshop.pdfIn PDF document text
    • http://moliwofasekimu.epizy.com/bitabegufuvugo.pdfIn PDF document text
    • http://palipesokugukux.epizy.com/chottanikkara_amma_devotional_songs_malayalam.pdfIn PDF document text
    • http://luremanoxe.epizy.com/hallelujah_sthotram_yesayya_song_free.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_off0000eaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA2 5272 bytes
SHA-256: 7a2af10af480bfb0d7e4b875d0b3cb09260a66aded4d5e2a33c826d152d096e4
font_01_sfnt_off0000fc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC72 11048 bytes
SHA-256: 3f700f2845f448a2bccc9b69cd6f946bb240a5f304ca78708265a26d0f4a6f10

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