Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbd8926ca06fddb…

MALICIOUS

PDF

79.2 KB Created: 2021-03-30 18:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63212791d6a241bd902c5827f0512d2c SHA-1: d267365af68d25fc053ed370bf33b400b38b3c6a SHA-256: fdbd8926ca06fddb33dda306e0b1c245d55ad8aafd55276068b12f490de90dd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, with one specifically pointing to a URL that appears to be a lure for 'algebra practice exam pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting a tactic to increase visibility for malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of the file, likely involving a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/award?keyword=algebra+practice+exam+pdf
    • https://cdn.sqhk.co/veladaxuzeba/LsgceXm/pitbull_dog_puppy_price.pdf
    • http://static-start.top/gimpys_on_150x78vj.pdf
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/rikejefe-mudanabogam-xiwebotukuboxe.pdf
    • http://instapriz.online/english_grammar_worksheets_for_class_54b8tc.pdf
    • http://dream-stat.ru/xisoxuwugovakaxidkyn6x.pdf
    • http://yourbigdick.space/bodyweight_exercises_for_chest_and_armsxlxr0.pdf
    • http://antinomi.design/fezopeje1zug5.pdf
    • http://phrensy.co/vulisorarituxiluvuzebrzxe1.pdf
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/9771138.pdf
    • http://hiziryigit.online/todanugegenifovankrfn9.pdf
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/jigotelisir.pdf
    • http://bcpreactiva-enlinea.com/como_calcular_mi_pago_de_seguridad_social4r1jj.pdf
    • https://cdn.sqhk.co/posaleren/H1Khigc/shogun_assassin_2_full_movie_free.pdf
    • https://cdn.sqhk.co/rewufarelaze/fRhdbih/labaduveromawexodizojo.pdf
    • https://fukenotaza.weebly.com/uploads/1/3/2/7/132740373/1585563.pdf
    • http://dress-russia.ru/lock_picking_set_buy_onlinearlu0.pdf
    • https://lepamume.weebly.com/uploads/1/3/4/8/134882258/fenude-jikivusuzo-jawil.pdf
    • https://cdn.sqhk.co/xenotami/gicjbge/super_sprint_race_weekend_2019_results.pdf
    • http://opendouche.xyz/zojikuwodojejfnb9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/voxazedisula/structural_causes_of_poverty.pdf
    • https://s3.amazonaws.com/fejenijovekozu/is_sense_and_sensibility_a_good_book.pdf
    • https://s3.amazonaws.com/lixisariwulo/96235356998.pdf
    • https://s3.amazonaws.com/fikuvine/witoxer.pdf
    • https://s3.amazonaws.com/bodajaku/bangalore_days_malayalam_movie_ringtones_free.pdf
    • https://s3.amazonaws.com/jitimesolagun/53225092028.pdf
    • https://s3.amazonaws.com/nuxepiduded/70720834103.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_off0000f544.bin
097746ba3a80fc472fd16e5e34d1cf7c32bef63ba16006d95ee3e5bccf5f3d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 5492 bytes
font_01_sfnt_off000107e4.bin
e6649974fec2054cc7d8de5f49ca3c5c492f30ee5f4dcb654b07aa836603878e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107E4 11580 bytes

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