Malicious PDF — malware analysis report

Static analysis result for SHA-256 538da30cb97ecb74…

MALICIOUS

PDF

85.7 KB Created: 2021-03-10 15:04:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 30b450ef41c5f22f0d13cdd395b8a62c SHA-1: b53d0b1cb514e74b54cb7d19c77a25dcbe08e4e8 SHA-256: 538da30cb97ecb74229552525bd18865efff4f99fc8027cfce25e4853053b21b
186 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous external links, many pointing to disposable domains. The PDF structure suggests it's designed to host a link farm, potentially for SEO manipulation or to distribute further malicious content. While no scripts were explicitly extracted, the presence of external links and the 'link farm' heuristic strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/award?keyword=fundamentals+of+electrical+engineering+mcqs+pdf PDF link annotation
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/divojomepunajaxenu.pdfIn PDF document text
    • https://nozodipipagim.weebly.com/uploads/1/3/1/4/131438171/2c7e13119939.pdfIn PDF document text
    • https://lopolovugafi.weebly.com/uploads/1/3/4/1/134109017/jijotoxatabu.pdfIn PDF document text
    • http://help-service-support.com/34869388241zntwo.pdfIn PDF document text
    • http://vaxuserinux.22web.org/android_rpg_multiplayer_bluetooth.pdfIn PDF document text
    • https://vilewufatavak.weebly.com/uploads/1/3/4/5/134585542/998910.pdfIn PDF document text
    • http://madamzero.com/45159869801ar0mq.pdfIn PDF document text
    • http://canonsburglake.com/976811911916hpi3.pdfIn PDF document text
    • https://zudejafig.weebly.com/uploads/1/3/2/6/132681624/fobefosirasilu_forulonafufuto.pdfIn PDF document text
    • http://mail-autoscout24.net/generos_periodisticos_cronica_noticia_reportaje_entrevistapy5xg.pdfIn PDF document text
    • http://takipleskazan.org/how_to_connect_anker_soundcore_liberty_air_to_iphonef57lq.pdfIn PDF document text
    • http://vk-settings-change.online/koladisikamaq712k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d085ecb-9f87-4cdd-8fc3-4770d2d8d796/percy_jackson_greek_heroes_audiobook.pdfIn PDF document text
    • http://jejivosijej.rf.gd/browser_moba_no.pdfIn PDF document text
    • http://zejajedep.rf.gd/cursos_de_ingles_basico_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b106b5af-3a1e-4587-9fba-836635fbfbb1/risugitarexulibasixi.pdfIn PDF document text
    • https://6d23287f-a15b-43b7-8d69-700c0e01f504.filesusr.com/ugd/185c00_0cda0424af654321a28501a09817d939.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/539ca6b7-6f1c-4c8b-aad8-5d8b32ebb591/scholar_dnd_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8d213e-6c54-4e4f-a5ff-0143536bb3c4/xuzoxufivofibuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26254dad-dcf2-4747-92f0-8e217270698b/42856839102.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_ac5c2147ddb04b9db9683a1b9ddfc8ab.pdf?index=trueIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_13a5a6f4bb224251aafb0e33e1814f5c.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_71481c9848ad40ddbd1432f055f30c26.pdf?index=trueIn PDF document text
    • https://ee6bc897-aa08-459d-b6e6-b1b1d69fcba1.filesusr.com/ugd/7ba596_53d7a4c027b3422d8c2b9b681182f1b5.pdf?index=trueIn 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_off00011053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11053 5556 bytes
SHA-256: 8165bd95c453566898fba78c2fccf25060776818687a617c30531727bd1fa455
font_01_sfnt_off00012321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12321 11204 bytes
SHA-256: f403aee4edcc1109b32e17330ccc375ef9a59f851edd0a06a98892131bb80496

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