Malicious PDF — malware analysis report

Static analysis result for SHA-256 0736462e37e87113…

MALICIOUS

PDF

68.1 KB Created: 2020-12-15 11:48:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: aac37c0c19293d8f79290ab2cb78467b SHA-1: 514a27ff8b0987de24f6b111b312fecb5f3ad655 SHA-256: 0736462e37e8711387c21d3644b67baf746373b2140d0334a5499cad90262bab
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple links to redirector infrastructure, specifically `https://cctraff.ru/strik?utm_term=oldham+county+schools+start+date`, which is flagged as malicious. It also hosts a large number of PDF links, suggesting a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=oldham+county+schools+start+date In PDF document text
    • https://nugemezan.weebly.com/uploads/1/3/4/3/134359438/rizepefonatove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_5fb39cb1165eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_5f8ca6e5e0c8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5fbf52968e864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fcb1f4e89c9f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416792/normal_5f9ba9e69accd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445541/normal_5fa2a3c5c98d8.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
    • https://s3.amazonaws.com/mojivikapeti/97055983592.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5066e104edf1d779b9afc/t/5fd05991a040431536bc6239/1607489938344/scary_granny_doll_the_horror_game_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc360b6bda9c57a97cdfd08/t/5fca5ca5faf9e00ac2426197/1607097509605/mudonine.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1480d27a199023ab7f389/t/5fc80d63723ab40260527545/1606946147945/dash_mini_dog_treat_maker.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc7aee6504bb4653ce6e043/t/5fcdc01f24c49707d33ed884/1607319586312/50206312401.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f0cad49dd12447345200/t/5fc51b7e9d7936484030aa16/1606753152776/harry_potter_goblin_actor.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/video_cutting_application_android.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC133 5140 bytes
SHA-256: 89b909ddf4e673ce52b3320df064baec4ef7296e23b7dcad1eb0b34ecb37a2ce
font_01_sfnt_off0000d28b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28B 10208 bytes
SHA-256: 7d5196eb7380f40ddc3910ba67bd66962adb4fb3e3c652f8ef3f06d8acc34504
font_02_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378