Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9d4399033783bd…

MALICIOUS

PDF

74.2 KB Created: 2021-03-31 06:39:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 094a50c72a5ba9deecb74c99ff2c69a6 SHA-1: 90f7a223900e597c51ff9e45a5b3a70c15b23b11 SHA-256: 4f9d4399033783bd2e0054b417cf63f3ed1659ab1fa0c721ba5f7a09901e2f80
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF SEO Link Farm', suggesting an attempt to drive traffic to various websites. One prominent URL, 'https://bologen.ru/wix?keyword=tamilserials.tv+idhu+kadhala', is flagged as suspicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure points towards a malicious document designed to exploit search engine optimization techniques for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://bologen.ru/wix?keyword=tamilserials.tv+idhu+kadhala
    • https://static.s123-cdn-static.com/uploads/4475734/normal_5fe335257c50b.pdf
    • https://static.s123-cdn-static.com/uploads/4417531/normal_5fdce4e23945c.pdf
    • https://cdn-cms.f-static.net/uploads/4490369/normal_604aa748de84c.pdf
    • https://cdn-cms.f-static.net/uploads/4379970/normal_60355a2a0e9e0.pdf
    • http://nugawijuxuv.mywebcommunity.org/29488334019.pdf
    • https://cdn-cms.f-static.net/uploads/4366302/normal_601e5769a8392.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6d18593d-d07d-447b-ab35-bac44601e0cf/best_tech_stocks_under_20.pdf
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_c748ae89b2204d3d84c7eac5e494da39.pdf?index=true
    • https://s3.amazonaws.com/regufojalojaza/milliken_publishing_company_worksheet_answers_mp4041.pdf
    • https://uploads.strikinglycdn.com/files/977f3742-3c58-46b1-828f-731c5ab2497f/sununag.pdf
    • https://uploads.strikinglycdn.com/files/09c4e2a6-49cd-4422-9472-4ce0a0469b2f/goripijovebogepa.pdf
    • https://uploads.strikinglycdn.com/files/15e9bacc-badd-4892-b527-49a9e4dd2bee/nothing_but_the_blood_chords_jesus_culture.pdf
    • https://uploads.strikinglycdn.com/files/c63f1186-f6d1-4aa2-bf2b-5b647440aa74/can_i_get_a_car_inspected_before_buying.pdf
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_0f6af0a27d9d4de588cfc121f0a555ae.pdf?index=true
    • https://uploads.strikinglycdn.com/files/bf34f096-8bff-4351-90c6-281399c2aee3/sowukawakitonozodim.pdf
    • https://uploads.strikinglycdn.com/files/9f151821-4084-40bd-8f1e-bf4f3cd0de6c/que_significa_el_signo_en_matematicas.pdf
    • http://purewowesajumu.myartsonline.com/povigodadekif.pdf
    • https://s3.amazonaws.com/jivuxo/which_of_the_following_is_true_about_text_structure_brainly.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_off0000e3b3.bin
2fb583caf88288e247537af732486891699fbae5819728b0f4d03c3c02ee9f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B3 5172 bytes
font_01_sfnt_off0000f51f.bin
93d38288356dcff61e62dda8857f76d2530ec8891648a5c3c69c5bc1397b8152		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 11040 bytes

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