Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdff1786bbe9eedb…

MALICIOUS

PDF

74.2 KB Created: 2021-03-13 15:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a93c7e4cbf52e45a679935bc0596706 SHA-1: d98c58d1cac74d77ebfc3fa71ac32a3cb02ac579 SHA-256: fdff1786bbe9eedb87b3cb6e9ec470b180fc0f6b4dd70e23d952672820003b17
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=cronica+de+una+muerte+anunciada+pdf PDF link annotation
    • https://muwevowaxa.weebly.com/uploads/1/3/5/9/135992822/8f74ddb527de63.pdfIn PDF document text
    • https://jibaruxika.weebly.com/uploads/1/3/4/7/134726637/4142377.pdfIn PDF document text
    • http://samoe-samaya.ru/lemejukoxikapafigusaver55djo.pdfIn PDF document text
    • https://gamitodotabezoj.weebly.com/uploads/1/3/1/4/131453651/bakirikewixib.pdfIn PDF document text
    • https://ragixadimeruwu.weebly.com/uploads/1/3/4/8/134897014/88421b09155cee.pdfIn PDF document text
    • https://dexovepiniputo.weebly.com/uploads/1/3/4/4/134400909/1c96d0f5208.pdfIn PDF document text
    • http://sedouche.xyz/how_to_become_a_general_contractor_chicagoh6mnk.pdfIn PDF document text
    • https://zomoxiwoginu.weebly.com/uploads/1/3/1/6/131637743/xebivosusovoromi.pdfIn PDF document text
    • https://balabirow.weebly.com/uploads/1/3/4/6/134690292/voriz_givixure_pokivak.pdfIn PDF document text
    • http://lami-lashes.site/man_down_lyrics_lil_durk0d8at.pdfIn PDF document text
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/a174ef226f.pdfIn PDF document text
    • https://zumugewij.weebly.com/uploads/1/3/1/4/131483128/katagadorokakow_senozus_kusajo.pdfIn PDF document text
    • https://revunisukigi.weebly.com/uploads/1/3/4/8/134849871/mobunedukudedod.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/5babed49-532a-433f-97f7-6f0daf73dd68/where_can_i_go_on_holiday_abroad_in_august.pdfIn PDF document text
    • https://s3.amazonaws.com/ladiwuzetawedi/walden_thoreau_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ade2bb-3f26-4f87-b1b8-56415be40d52/tutufetegiwazozupab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dad64d25-83ba-400d-b82a-ec3561ec8e08/tagurufokadikewukoxufi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18c1f77c-98d8-44d3-a30b-ef146003f73b/their_eyes_were_watching_god_chapter_9_quizlet.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/35380805286.pdfIn 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_off0000e6d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D6 4996 bytes
SHA-256: 5453cd6ad08c5c72b4a7ebf8bed1c442619ba41735a809162462130ad0a200dd
font_01_sfnt_off0000f7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BE 10512 bytes
SHA-256: 99802b670110ccb56c26fd263934971c62252cd13efb20ed6d73f3e0d8da20fb

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