Malicious PDF — malware analysis report

Static analysis result for SHA-256 732b22a654f0e0d6…

MALICIOUS

PDF

72.0 KB Created: 2021-05-28 00:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 667a8fbc6a2b92c19664fb496537232a SHA-1: 40cf3a8577ad10e6849f89368b9596d4ce6e0bdd SHA-256: 732b22a654f0e0d65572079ebfceb4d8f2d288dcedd564f5c2f58431b65e3a9a
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it is a PDF containing a mass external link farm. The document body is heavily obfuscated, but the presence of numerous external URLs suggests a phishing or SEO manipulation scheme. No scripts were extracted, but the PDF structure itself facilitates the hosting of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=conjunction+worksheets+7th+grade
    • https://cdn-cms.f-static.net/uploads/4411481/normal_5fda2a1ce81d0.pdf
    • https://xetomulezaze.weebly.com/uploads/1/3/0/9/130969551/vokidiketu_betumanazobebik_dujoxagoni_nowakegajune.pdf
    • https://fifeguku.weebly.com/uploads/1/3/4/7/134733895/398652c9b25.pdf
    • https://static.s123-cdn-static.com/uploads/4426810/normal_5fe18d589d7ae.pdf
    • https://cdn-cms.f-static.net/uploads/4370561/normal_604cd4fca7d58.pdf
    • https://static.s123-cdn-static.com/uploads/4367305/normal_6004d95ed2b95.pdf
    • https://taleputara.weebly.com/uploads/1/3/4/3/134305900/xigovavur.pdf
    • https://cdn-cms.f-static.net/uploads/4414173/normal_603e88be098aa.pdf
    • https://cdn-cms.f-static.net/uploads/4378613/normal_605b86200811b.pdf
    • https://cdn-cms.f-static.net/uploads/4420025/normal_5fd61a97e041c.pdf
    • https://tinuvireredat.weebly.com/uploads/1/3/4/8/134864568/lujabopupegaj.pdf
    • https://cdn-cms.f-static.net/uploads/4486521/normal_604d8221d0097.pdf
    • https://bewebisiseten.weebly.com/uploads/1/3/0/8/130874130/3824540.pdf
    • https://cdn-cms.f-static.net/uploads/4456660/normal_600e5beba31f4.pdf
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/neluwenukinuji.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/327bc302-7b27-4360-b252-af3007b95345/how_to_use_blendjet_portable_blender.pdf
    • https://uploads.strikinglycdn.com/files/110295fb-9304-4d91-a331-655d3c67cd31/nozuzo.pdf
    • https://uploads.strikinglycdn.com/files/107c0921-8b16-4ca8-bf7b-8c857d148031/how_to_put_reusable_k_cup_in_keurig_compact.pdf
    • https://uploads.strikinglycdn.com/files/48d49e17-455e-4ee0-93dc-281026e390c1/17973047993.pdf
    • https://uploads.strikinglycdn.com/files/d3997457-b137-4e00-a878-46f73aacbfa9/maze_runner_3_film_collection.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_off0000dcaa.bin
3d36a2b959fcdb8de0f667e8be7efc5b3474f7c5b2ea72b860d8200efd05d4a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 5388 bytes
font_01_sfnt_off0000ef10.bin
fdb94da41cbd848f448b2ddb76b2d36814959e94b9116d187a15c6d5f0d84799		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF10 10468 bytes

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