Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cefbc801d68b19e…

MALICIOUS

PDF

84.4 KB Created: 2021-04-03 08:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7b6e2da8092d054555da61b8becee0e3 SHA-1: 56657b01cb985c2b92c4322377c6fba8834946af SHA-256: 1cefbc801d68b19ee40714d898a36132b3aa1c2c436cff0e31ecb48c141caa91
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are the primary indicators of compromise.

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://lozipotod.ru/wix?keyword=literal+equations+word+problems+worksheet PDF link annotation
    • https://mozibidu.weebly.com/uploads/1/3/4/7/134763316/34a535179d.pdfIn PDF document text
    • https://karubidodofibe.weebly.com/uploads/1/3/4/3/134316277/xerivava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451940/normal_601933efe132a.pdfIn PDF document text
    • https://tarofojazen.weebly.com/uploads/1/3/4/2/134235484/9e70bf8e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416143/normal_5fc6f1615c769.pdfIn PDF document text
    • https://mutosonagok.weebly.com/uploads/1/3/4/3/134316738/lomoset.pdfIn PDF document text
    • http://zefujixa.mywebcommunity.org/ssr_side_by_side_170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410190/normal_603ab4566ba4b.pdfIn PDF document text
    • https://noxijinijomud.weebly.com/uploads/1/3/4/7/134746703/3028213.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/1b34c1c9-d974-473c-878d-e78d3bb2600c/loxadud.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_5de5159f05ce4b5591799ef1d190bddf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/04b6f9b7-bd91-4f41-98a4-fcde4c5d2992/netgear_n600_wifi_not_working.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_54d384e879594133ad6c0a8d43632822.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/007de28c-5ec5-47a3-9f70-b8d34d59483a/puvoripisijivatiletifiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014f380b-2347-4648-9f16-6032077b056b/electrical_installation_symbols_for_drawings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e001777-ca14-468b-922e-cb50dadca839/value_of_dale_earnhardt_collectibles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d00b21e-6880-4bb3-923b-942bd47f412b/is_there_a_samsung_tv_remote_app.pdfIn PDF document text
    • http://wugerubuvugox.myartsonline.com/cctv_video_surveillance_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96230b61-d86c-4c49-8bfd-c4f73be9fbd2/52010015716.pdfIn PDF document text
    • https://06ebba1c-c738-45d4-b58d-83edbdcc9420.filesusr.com/ugd/b14caa_a176cbd7a2294912be48dabad14adf3c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D0 5564 bytes
SHA-256: c03dfa8ed770a3c173cc58895aa07da56802fb8b2f85f8b98cfe4bd2057f503d
font_01_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 11284 bytes
SHA-256: 118e4acf0e698e48884ae2242d361954dc88c75e2480eb6bcdb3e683bbc1d395
font_02_sfnt_off00012c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4C 16368 bytes
SHA-256: ed80ac131c33f3bb804a15242af58d8680340fed71ee29519f86f2f1e989e549

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