Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae5cad67ecf02e1…

MALICIOUS

PDF

110.0 KB Created: 2021-03-18 06:25:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a412e8bc91b1e6e21a7bd7f11c02dc7b SHA-1: 115fdc520ee5d5fae734202dba1b99973e22b655 SHA-256: 9ae5cad67ecf02e1dd91f4076010651afd6509d6370eb9b3ab51b24dc4900ed8
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, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • 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://nipisod.ru/strik?utm_term=tecsun+pl-380+manual+pdf
    • https://jajesawi.weebly.com/uploads/1/3/0/8/130813829/5fa9d0545cd45b.pdf
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/lifalovit.pdf
    • https://norenepativen.weebly.com/uploads/1/3/4/3/134315866/sowikafizipu_kiwipezog_sibep_donomazobopebef.pdf
    • http://xuzobinemipivor.mygamesonline.org/33094976053.pdf
    • http://topstop.site/software_para_el_monitoreo_de_redk76ad.pdf
    • http://sugameloxufe.mywebcommunity.org/bisemuk.pdf
    • http://trydouche.xyz/3312314681a30bt.pdf
    • http://bavedibigilomit.66ghz.com/galatea_effect.pdf
    • http://kimidenexikox.getenjoyment.net/dobewajifov.pdf
    • http://com-servers.online/460641703960g2ow.pdf
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/1854479.pdf
    • https://kekageguva.weebly.com/uploads/1/3/0/7/130776826/bipel_jalukogenan_loritetizu.pdf
    • http://fimewot.xyz/69194819926ywwl9.pdf
    • http://fuzubijixulux.mygamesonline.org/tanda_gejala_penyakit_jantung_koroner.pdf
    • https://xiruzukigipimog.weebly.com/uploads/1/3/4/8/134865515/sugozux-lobesuzoge-xegaximufurofad.pdf
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/titapejuxewalenoxe.pdf
    • http://reduslimitalia-official.website/16932426469mdgk0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wevumixedin.rf.gd/46639585238.pdf
    • http://nibinelageniwir.epizy.com/85038804691.pdf
    • https://s3.amazonaws.com/limepusotanal/hydraulic_acid_sheet_mask.pdf
    • http://vudajerex.rf.gd/beetle_crazy_cup_pc_game_free.pdf
    • http://fonobufusig.rf.gd/2019_ram_1500_bed_weight_capacity.pdf
    • http://rukosivujuxu.atwebpages.com/98901700204.pdf
    • https://s3.amazonaws.com/wapabefizosumi/ritarewupat.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014c21.bin
7cfe0f568c8fe0871f253398d19f14f56b2ec7f0ded3c7c8caa7fb3d4dc33a2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C21 3076 bytes
font_01_sfnt_off00015723.bin
9ebe84140dc111ea1b27d5a74a6ef9f589a867b10a4e94b2e430be4803f9c82f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15723 5688 bytes
font_02_sfnt_off00016a7c.bin
a2be917d4f1ceab5200698ea08da25ce94c3e2f0b82c42cd69e2c5e55cbdba96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16A7C 12224 bytes
font_03_sfnt_off0001943a.bin
7c39cc3a82b28d798af0a0efe753ccab1601c16e3d273b68bce63af749374a5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1943A 16416 bytes

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