Malicious PDF — malware analysis report

Static analysis result for SHA-256 40df6c13648a80d4…

MALICIOUS

PDF

122.8 KB Created: 2021-03-23 05:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6647fa2298cce3de5361287fb7545fd4 SHA-1: 5078d17cb75f66e9072c782e67df4f82857702d6 SHA-256: 40df6c13648a80d4768a3d4896c1f1c458ecfdd6512e2c5fbeb4e0dc20f1f520
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, characteristic of a link farm. The document body is heavily obfuscated and appears to contain junk data, suggesting its primary purpose is not to convey information but to redirect users to potentially harmful external sites. No scripts were extracted, but the presence of numerous URLs points towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=is+baldur%2527s+gate+2+multiplayer
    • https://reluxepeguru.weebly.com/uploads/1/3/4/3/134363030/kaxotezos.pdf
    • http://lamakexo.scienceontheweb.net/epson_wf-2530_printer_wont_print.pdf
    • https://tekebuzegox.weebly.com/uploads/1/3/0/8/130814382/mires-jumef-gijijobabaduja-jusirezuvage.pdf
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/1969289.pdf
    • http://retapadu.medianewsonline.com/96194615447.pdf
    • https://static.s123-cdn-static.com/uploads/4377717/normal_5feb22df660a3.pdf
    • https://welomutulek.weebly.com/uploads/1/3/4/8/134873792/ad37ec.pdf
    • https://cdn-cms.f-static.net/uploads/4389604/normal_603d0cf6e7fd6.pdf
    • https://cdn-cms.f-static.net/uploads/4487423/normal_60350bc8eb46c.pdf
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/7755363.pdf
    • http://newonesitel.22web.org/bittorrent_free_ios.pdf
    • http://luxomozuk.mypressonline.com/metamorphic_minerals_in_thin_section.pdf
    • https://cdn-cms.f-static.net/uploads/4370264/normal_60571e7953a68.pdf
    • http://sovolox.getenjoyment.net/2007_ford_6.0_turbo_rebuild_kit.pdf
    • https://vifusixediw.weebly.com/uploads/1/3/5/3/135312005/damonamir.pdf
    • https://tuwagufo.weebly.com/uploads/1/3/3/9/133999840/8263236.pdf
    • https://dexuganepo.weebly.com/uploads/1/3/1/6/131608037/bafaniviwosodajuxal.pdf
    • https://static.s123-cdn-static.com/uploads/4464524/normal_5fcc8fe16186b.pdf
    • http://fuzubijixulux.mygamesonline.org/resumen_por_capitulos_de_la_obra_un_grito_desesperado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vekowaxijoperun.rf.gd/vufuti.pdf
    • http://kulipipuxafoja.epizy.com/77406789247.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_off0001a3b0.bin
da9e5148c95c41ed40837e964282f9fe51ea77d476d75a76e82a4c8d12e22d08		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3B0 5624 bytes
font_01_sfnt_off0001b6c0.bin
7c43ddc01cc414a2225e7f6129e12cb7d481104ce3639d924e9b8a3870ab8b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6C0 11656 bytes

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