Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e8e5b1e3b6323f…

MALICIOUS

PDF

77.3 KB Created: 2021-03-17 02:26:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 82b2457d4659a6e3e89bc7a4ed5efdc2 SHA-1: b1e07ea8d6b37c89cfc65ee04e0b8604706c7887 SHA-256: 56e8e5b1e3b6323fd46ddf4973429ff44d281ae74ccb63a25df090e5e1eab1b9
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, one of which points to a potentially malicious domain (jacksth.ru), suggests this document is part of a phishing or spam campaign. The ClamAV detection further supports its classification as malicious. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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
  • 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://jacksth.ru/award?keyword=girl+scout+cadette+badge+pdf
    • https://static.s123-cdn-static.com/uploads/4415334/normal_5fcd181698193.pdf
    • https://cdn-cms.f-static.net/uploads/4388619/normal_60400526df56b.pdf
    • http://nuwojukow.mygamesonline.org/lokuvemud.pdf
    • http://sosuziba.mypressonline.com/pdf_text_editing_software_free_download.pdf
    • http://worelimupuvefam.mywebcommunity.org/why_does_my_wireless_headset_keep_disconnecting.pdf
    • https://static.s123-cdn-static.com/uploads/4492529/normal_5fc9437bef8d0.pdf
    • https://cdn-cms.f-static.net/uploads/4487197/normal_5fd851333fc44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ginutu/tajiwotujumemoretetip.pdf
    • https://s3.amazonaws.com/jijari/regression_test_suite_template_excel.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_ea7db50c64cc413fb320c10416211c79.pdf?index=true
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_78ab366a48b640858292c315f610fc80.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3ddda230-f85b-4fd0-97aa-1136505f3954/56093643687.pdf
    • http://sewemira.atwebpages.com/42936477037.pdf
    • https://s3.amazonaws.com/bisiku/pekakapupumizik.pdf
    • http://gozenabuzixi.onlinewebshop.net/3693875034.pdf
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_aab46fa14c274118ad4e3f09e5f6afbd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4bc80f62-5f4c-4a2c-b029-5a874a41b9dd/how_to_pair_ihome_speaker.pdf
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_a1bea5789130495c891aa64768852bdc.pdf?index=true
    • https://s3.amazonaws.com/nonabafat/26644291018.pdf
    • https://s3.amazonaws.com/tubukeganuji/14339335998.pdf
    • https://s3.amazonaws.com/boxujetanonikuv/71867181318.pdf
    • https://uploads.strikinglycdn.com/files/f6ba3f81-2afc-4072-b642-8b76bf6f8489/how_to_compress_an_audio.pdf
    • https://s3.amazonaws.com/sulasatevirexo/junor.pdf
    • https://s3.amazonaws.com/nonabafat/jogepujoxedusuf.pdf
    • https://uploads.strikinglycdn.com/files/264f00fa-087b-4fd1-803f-fd6ff98316bb/pibikujabadofumozezov.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_off0000f121.bin
708888f3fee39979605023dad1cbb4230b922ce5592accbcc6f58abf9bd28c56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 5496 bytes
font_01_sfnt_off000103e1.bin
335d3ef525851a4d16d3129e67bc23b5bc096b751386b86f2428f95e00560c41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103E1 10468 bytes

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