Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6298d9b739b43e…

MALICIOUS

PDF

84.4 KB Created: 2021-05-19 14:46:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 10fa3f648d4c1fe2b1ec80842a153109 SHA-1: e08139896dfb1fd07cadc338ed47ce115c2aea74 SHA-256: fb6298d9b739b43e5e6f639b8d5a6692055bc676f497b62ed34b8e40da747744
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to disposable domains or are used in a link farm strategy, suggesting a malicious intent to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate this is a phishing or trojan PDF. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=convertidor+de+pulgadas+a+centimetros+google PDF link annotation
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/69481306b8a6.pdfIn PDF document text
    • https://fozibopabedabe.weebly.com/uploads/1/3/6/0/136082219/b81e097ac34ba.pdfIn PDF document text
    • https://fatilisuwojumo.weebly.com/uploads/1/3/4/6/134652656/1808ba33632109.pdfIn PDF document text
    • https://xulasimij.weebly.com/uploads/1/3/2/8/132814518/472608f7.pdfIn PDF document text
    • https://gowutejuvotebap.weebly.com/uploads/1/3/4/3/134372770/tijejovuwosusuxopo.pdfIn PDF document text
    • https://tupewolukup.weebly.com/uploads/1/3/0/8/130813866/ganilumo.pdfIn PDF document text
    • https://lunixomowomok.weebly.com/uploads/1/3/4/8/134859132/88858c54ed4.pdfIn PDF document text
    • https://xisuludibu.weebly.com/uploads/1/3/5/3/135300694/482cdd8f8413.pdfIn PDF document text
    • https://vabeluzaxudi.weebly.com/uploads/1/3/4/8/134884936/rupagu.pdfIn PDF document text
    • https://rofaxebawo.weebly.com/uploads/1/3/4/7/134750080/8681964.pdfIn PDF document text
    • https://rirujidina.weebly.com/uploads/1/3/5/9/135957349/sugarexinagok.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/kawotexulozax/kabedapumozib.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/behringer_xenyx_x2442usb_fx_manual_en_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/tee_shirt_template_vector.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09b9d95-8c0d-4266-84c8-fdae689574fe/bluest_eye_chapter_2_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79281659-bb8a-4b12-b011-c56f6b3462af/68410769664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf097e8-1dfc-48c4-b8d3-0e1a1a239df8/89094255569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/345a9ed1-d4be-419e-af19-9954c9e54d0d/pivuborifiv.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/koluzitipika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caffee1e-0ea5-4dbf-8ce3-dd7f5eecfd37/dd_3.5_equipment_slots.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a25875-cb41-4983-ad2f-49fb23205f05/siseweponetuzus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/626d2fc7-cc04-41da-9d7f-a1ee11633439/can_i_renewal_my_drivers_license_online.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_off0000fa31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA31 5356 bytes
SHA-256: 17a644433d2b96d692583f46b482f92f590639d5c1f2bb6619a2c0b813586b3f
font_01_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 12556 bytes
SHA-256: ae61e0a826ce3f7dcd14baea920c646f5baaa4d27b57c42cd44820d6d0916b93
font_02_sfnt_off00013586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13586 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176