Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1fc772fc9eb01cb…

MALICIOUS

PDF

87.2 KB Created: 2021-04-06 07:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e36fccc807d157b18cfd07be7a241eb7 SHA-1: f3baa595ca40c0b187e91dc69f7945b3e49ff242 SHA-256: f1fc772fc9eb01cb5093be14d5c98a02d9048e08e0c66cf6b0b641bfcc22950d
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be designed to redirect users to malicious or spammy websites, as indicated by the PDF_URI and PDF_SEO_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://ponafet.ru/award?keyword=broiler+production+handbook+pdf PDF link annotation
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/9691456.pdfIn PDF document text
    • https://gujojiri.weebly.com/uploads/1/3/4/4/134434224/gazugosarirupi.pdfIn PDF document text
    • https://wugumura.weebly.com/uploads/1/3/4/6/134601103/182ca2b3c0f0799.pdfIn PDF document text
    • https://sokuvefababadax.weebly.com/uploads/1/3/1/8/131856373/maxifesogudalis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_75adb4064f3a4ac097991415705ed112.pdf?index=trueIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_e1391198e94e4e03a6619a473258fbba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b17abd0a-c1cf-480c-8ec2-96b7d7f4d7a6/49702428293.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab529d1a-dd5a-4cbc-bfde-0aba0d04df32/zabolotopixi.pdfIn PDF document text
    • http://melovawofijubab.epizy.com/70171915800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36006519-caa7-4af1-b351-2197edcbe8e4/how_to_make_a_study_guide_for_chemistry.pdfIn PDF document text
    • http://lisudanuzi.epizy.com/vufedavemukararefikariw.pdfIn PDF document text
    • http://pitudug.epizy.com/lemojasuronaborifaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ae53717-8cf6-4c88-8f4f-ed6d7a0c623e/how_to_connect_jabra_bluetooth_headset_to_macbook.pdfIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_bfc6f5aac3214450ac23bf9067db552d.pdf?index=trueIn PDF document text
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_8e590eb4610945fa8d958985d038ab94.pdf?index=trueIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_1d6ac7e935564c42a8592871b2a91014.pdf?index=trueIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_d45e9170cff641d6936489d05bf71d8b.pdf?index=trueIn PDF document text
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_f0f884109c5d4dd5bc43e1081f99c21d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a10109a3-f5ab-47ff-b2d3-20a24be854ae/will_ocarina_of_time_be_on_switch.pdfIn PDF document text
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_94c69f49b5df42829c853949937c5a26.pdf?index=trueIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_6a9fc143d00c49c2b901b6c0612ffb32.pdf?index=trueIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_9aaac8ec426a457e972d2d39ed375b97.pdf?index=trueIn PDF document text
    • https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_6bf765fe12fc47f3a5f94c3fd7df31c2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 5200 bytes
SHA-256: 34ba08bee9c5ab1465f574b4ccd8d4983a0ae457cbdd5fa89eee4e5e9d7877d9
font_01_sfnt_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 11244 bytes
SHA-256: 615fcb374cc171b00f3520d615999e76aa85aa1ced2065209ff62fadde4822ae
font_02_sfnt_off000140c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C5 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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