Malicious PDF — malware analysis report

Static analysis result for SHA-256 829683b54c26404b…

MALICIOUS

PDF

118.5 KB Created: 2021-02-21 23:08:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: a76b3ba3b30aad8360b392864e5537b6 SHA-1: ff43a334059c7d5aac850dfddf1469fea20f81a1 SHA-256: 829683b54c26404baed7f29182f4f864c0b27a2bd4e4ea0468f3c41d4c0e92ad
196 Risk Score

Malware Insights

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

The PDF document contains numerous external links, identified as a link farm for SEO purposes, with a primary lure related to 'enlightenment philosopher john locke'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, and 'PDF_SEO_UTM_REDIRECTOR_LINK' points to a free-download phishing scheme. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/wix?keyword=enlightenment+philosopher+john+locke PDF link annotation
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/7082195.pdfIn PDF document text
    • https://cdn.sqhk.co/rogotojuseb/bgd9Yha/rusty_blower_3d_mod_apk_download.pdfIn PDF document text
    • https://radigaligoled.weebly.com/uploads/1/3/4/3/134333621/9738348.pdfIn PDF document text
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/javejolufijizub.pdfIn PDF document text
    • https://babanude.weebly.com/uploads/1/3/4/0/134017813/8111210.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/BhgEJii/hexion_geismar_plant.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabure/ijDEidD/favulapavomowikuleba.pdfIn PDF document text
    • https://goxepafanaba.weebly.com/uploads/1/3/0/7/130739763/gosikumix.pdfIn PDF document text
    • https://miwevedadig.weebly.com/uploads/1/3/1/4/131437981/a75c6298.pdfIn PDF document text
    • https://vesizolakaz.weebly.com/uploads/1/3/4/3/134333528/ba00a7.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/idOihN4/17937654388.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/jasipefulaxiduj/insulation_ceiling_sheetrock.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/61531008975.pdfIn PDF document text
    • https://s3.amazonaws.com/tubukeganuji/jomawimerulofafodo.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/carbon_black_defense_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/24001457046.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/97682273998.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/sizapule.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/le_gaspillage_alimentaire.pdfIn PDF document text
    • https://s3.amazonaws.com/kovezux/bird_distress_calls_free.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000195f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195F1 5236 bytes
SHA-256: 492ed4b875b0fdee6c04c93873261950402bc716fa9deff1718b892fe4c08a69
font_01_sfnt_off0001a7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A7A3 11244 bytes
SHA-256: 799202e46d4d9a9b96d659f4144599afe4b48950e65cb7352d361edc8277786c

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