Malicious PDF — malware analysis report

Static analysis result for SHA-256 d52c13e019df3ece…

MALICIOUS

PDF

76.3 KB Created: 2021-06-06 20:52:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 03ad52eb170a3e03f25295acc2a2f18e SHA-1: cfc2407745939f75af47ff35a1fe692c64c760f0 SHA-256: d52c13e019df3ece6db553395bfff106601916c80c7b2585faf84af13afc903f
186 Risk Score

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 0.9997

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://synerhu.ru/pbw?utm_term=how+to+deal+with+a+borderline+personality+disorder+husband PDF link annotation
    • https://xafijedalab.weebly.com/uploads/1/3/0/7/130775792/1ce54d66e4513f.pdfIn PDF document text
    • https://dujeranisijoku.weebly.com/uploads/1/3/0/7/130776063/2bbcd.pdfIn PDF document text
    • https://boxepupobitu.weebly.com/uploads/1/3/4/5/134587113/walijopafifitajofib.pdfIn PDF document text
    • https://pemolopudamas.weebly.com/uploads/1/3/4/7/134753943/tigorerorekezib-sorazado-gomomafunaba-fotitupekof.pdfIn PDF document text
    • https://tumozoredupoki.weebly.com/uploads/1/3/0/9/130969837/1aeac796ca2117.pdfIn PDF document text
    • https://vusowosunuk.weebly.com/uploads/1/3/5/9/135975823/0066ab0c.pdfIn PDF document text
    • https://luvalebasewe.weebly.com/uploads/1/3/5/3/135326782/bolomubu.pdfIn PDF document text
    • https://finutobinito.weebly.com/uploads/1/3/1/4/131406284/nojikaw.pdfIn PDF document text
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/pinenuvuzi-xagetidorajof-tokal-bobitifeneg.pdfIn PDF document text
    • https://pugiputofal.weebly.com/uploads/1/3/4/7/134740318/demujuloled_dudizax_jelupawodenepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144573480/are_verity_and_tristan_still_together_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceebe3dc-0137-4c37-99a1-e5eb84f80bc7/29416057592.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/how_to_say_please_find_attached_in_german.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3830a2b-0268-4692-82a8-93bb0f6acfdc/jakanupadofuvupabajobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af58f898-45bd-413e-9c7e-5f20bdcb6b90/46239882335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2176dd20-3616-4ced-b536-40d0a6cffdb2/62516448574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3107ab66-7e28-4096-be9f-51d553e2bc1c/35375644894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e4ba97-1036-4189-84b0-ea1e630be85b/linksys_e1500_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06394ceb-2525-4b91-93b5-866df055fa22/anupam_typing_book_free_download.pdfIn PDF document text
    • http://kolelulu.pbworks.com/w/file/fetch/144562008/xemesufiwegawijurasuziti.pdfIn PDF document text
    • http://vibasuvezuz.pbworks.com/w/file/fetch/144584745/java_programming_interview_questions_and_answers_for_freshers.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_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 5344 bytes
SHA-256: 32d9384a44e2a487753ab7da61591d101bcfd2530026a51da0ad599eaec7fc49
font_01_sfnt_off0000ffb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB0 10396 bytes
SHA-256: 1b4291eb5f203453562013b63741f637a69bb9346371d5beb5c2da9b337d79fd