Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11af048d201faf2…

MALICIOUS

PDF

72.3 KB Created: 2021-03-24 18:09:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c306dc5dc830fee335b40252d906e2a SHA-1: 6e33404a552466b278ee5955761fab89e52decdc SHA-256: e11af048d201faf2ebbdfb64af531bc67c3f36cf8f838984a0d2ac04d9ea7a42
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing lure. The primary URL, 'https://zajinet.ru/award?keyword=jaypee+physiology+book+free+download+pdf', is presented as a free book download, a common social engineering tactic. ClamAV and ML classifiers strongly indicate malicious content, likely a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/award?keyword=jaypee+physiology+book+free+download+pdf
    • http://kutegexuwudaro.getenjoyment.net/canon_rebel_xt_cf_card_capacity.pdf
    • https://cdn.sqhk.co/libobivole/NbSMhd9/9689089822.pdf
    • https://tamilavijunaw.weebly.com/uploads/1/3/4/5/134506647/sakubinufom.pdf
    • https://cdn.sqhk.co/gejixoneku/Gjtjgje/mimpi_dreams_switch_review.pdf
    • http://kojazunupetip.mygamesonline.org/wazaraxilinanop.pdf
    • http://ganitigusawev.mygamesonline.org/37296901787.pdf
    • http://raxewaponoxiv.mygamesonline.org/la_siesta_del_martes_preguntas_de_comprensin_y_respuestas.pdf
    • http://bupimobim.sportsontheweb.net/kolonaporovitemobasatumut.pdf
    • https://cdn.sqhk.co/dijabidasu/vwjhejf/absolute_rc_heli_sim_hack_download.pdf
    • https://cdn.sqhk.co/julubesaf/jdhgdig/fosabiwonowiw.pdf
    • https://cdn.sqhk.co/dubagelojuwe/PhgTagg/lagevofazolel.pdf
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/1632519.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fivebo/lonely_planet_magazine_competition.pdf
    • https://s3.amazonaws.com/radubozufiwo/why_we_celebrate_birthdays_quotes.pdf
    • https://s3.amazonaws.com/wizuluworafid/dimabemexigosujapisavori.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/37626848004.pdf
    • http://seroroxunabolu.onlinewebshop.net/pafalepemowoxuwo.pdf
    • https://s3.amazonaws.com/pevarijidasalop/dobukosupowukodi.pdf
    • https://s3.amazonaws.com/radubozufiwo/template_blog_personal_gratis.pdf
    • https://s3.amazonaws.com/gurowozenupifi/buruluzajuketunazenu.pdf
    • https://s3.amazonaws.com/jeromisixinolib/21021144378.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de87.bin
4fc3e21be28f1a6672f2840ec2aaae8988e88984929c13b4b0d8895b46969ed3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE87 5688 bytes
font_01_sfnt_off0000f1f9.bin
029cecafcd8a17ebbf6df18473891f0d80c048c4567bd436334d385e49d66cd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 9920 bytes

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