Malicious PDF — malware analysis report

Static analysis result for SHA-256 5854fbcd9d69c31c…

MALICIOUS

PDF

78.5 KB Created: 2021-02-19 05:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3e734436c71a4092076bd60b2541da18 SHA-1: 37016e6eb231b6ec5fe651e7b7f7ccd4560cf317 SHA-256: 5854fbcd9d69c31c27ea01f3d299f92c4803d238acd40a26f4d3c2ab3696a6dc
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

Heuristics 5

  • 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 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://jottigo.ru/wix?keyword=america+needs+its+nerds+multiple+choice+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476301/normal_6010c37ed57c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386613/normal_602304df0ef35.pdfIn PDF document text
    • https://gegadibiliwo.weebly.com/uploads/1/3/1/8/131871883/944914.pdfIn PDF document text
    • http://enots.space/barbara_o_neill_books2qnu0.pdfIn PDF document text
    • http://springtea.space/2978826619eviow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_5ff3f1fbacd0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448984/normal_5fdf7cce1ed62.pdfIn PDF document text
    • https://dofabogadu.weebly.com/uploads/1/3/0/7/130739956/3623226.pdfIn PDF document text
    • http://begdas.fun/73079861911eyktl.pdfIn PDF document text
    • http://inostrana.com/is_wool_flammable_minecraft6ooxn.pdfIn PDF document text
    • http://romeital.space/kipokesexmpo2.pdfIn PDF document text
    • http://solhq.xyz/jetusubedufebasurnsl.pdfIn PDF document text
    • http://lajulikimerojeg.22web.org/best_qcy_dashcam.pdfIn PDF document text
    • http://help-copyrighteamservice.com/lifunewapavoj3nsa.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
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABD 3652 bytes
SHA-256: 7b5702a4fdf934aedcc4a52609a58a74f2b6f595729e242455c01f14323d7a7a
font_01_sfnt_off0000e7e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E4 5440 bytes
SHA-256: 79287221493b26b46dc71594c9ddd3b67b0535ef86414adece20963ef9872829
font_02_sfnt_off0000fa3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3C 10488 bytes
SHA-256: bf49668c2ac0209957bb4d4f72ff1ad99e41f964d75aac9dcaed91f0650ffb45
font_03_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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