Malicious PDF — malware analysis report

Static analysis result for SHA-256 20007cdb154c2607…

MALICIOUS

PDF

106.4 KB Created: 2021-02-28 19:01:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: aa54dda0735d27d61ae354499be5ff09 SHA-1: 3073c26ce4fe6397d02468d9d35c0ab9cd08b9af SHA-256: 20007cdb154c260776710fc7ecf627763128dd75bf941c85a8c640f3e7037fb9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9997

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 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.
  • 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://botokaw.ru/123?utm_term=how+to+find+conjugate+of+wave+function PDF link annotation
    • http://com-signto2.xyz/disobey_the_law_meaning_in_hindi3d82t.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481273/normal_600f698b68839.pdfIn PDF document text
    • https://tuxutumixebapi.weebly.com/uploads/1/3/1/4/131438514/golegoda_sejusugojab.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/social_history_of_art_arnold_hauser.pdfIn PDF document text
    • http://likedizar.medianewsonline.com/how_to_replace_stove_top_knobs.pdfIn PDF document text
    • http://compte-cmbretagne.best/10205797509al699.pdfIn PDF document text
    • http://hookup153.site/87938444454n18uc.pdfIn PDF document text
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/netuwi.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/schwinn_250_recumbent_bike_for_sale.pdfIn PDF document text
    • http://cloudmarket.website/percy_jackson_first_book_plote9ol7.pdfIn PDF document text
    • http://nokojatagi.mywebcommunity.org/retunakimurupoki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/veximigerapa.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/tezopuxomuwalizeraxipeli.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/granny_pc_free_igg_games.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/el_arte_de_la_guerra_sun_tzu_pelicula_completa.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/report_nuisance_calls_sky.pdfIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/wuwotimimav.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/30869361670.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001652e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1652E 29868 bytes
SHA-256: a79b19d469038722d90ad2ed32ad71039442513c33946c47727d17e6d06468f4
font_00_sfnt_off00012b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 5072 bytes
SHA-256: 23903a0f791aafb51d6e8417a824bb2401ce96aed956f952f3a480cbf460f2c0
font_01_sfnt_off00013cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CC3 11872 bytes
SHA-256: 8fd176a165e18c1ebfefa4c04e2ae4791b1e82a84aaad82c5c74c6ec93128649

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