Malicious PDF — malware analysis report

Static analysis result for SHA-256 5462a2fe2d764bda…

MALICIOUS

PDF

68.0 KB Created: 2021-05-30 11:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 4e4ae2808449ba747750c822258c3c69 SHA-1: d3b06137609b68270f511f65108efaa8ac88e817 SHA-256: 5462a2fe2d764bdae5a3d23366b8d572ac269c586d109a4a70aa1591392225d9
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The file contains a large number of embedded URLs, suggesting a link farm or phishing attempt. The ML classifier and ClamAV also strongly indicated maliciousness. The primary malicious IOC is the redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/strik?utm_term=t%25C3%25BCrkiyeyi+sembolize+eden+mekanlar In PDF document text
    • https://xowivana.weebly.com/uploads/1/3/0/8/130813667/sipigarifopejogobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481280/normal_602b6e88282b5.pdfIn PDF document text
    • https://nupuwuzom.weebly.com/uploads/1/3/1/4/131438231/97c10b29.pdfIn PDF document text
    • https://vesilaxevi.weebly.com/uploads/1/3/4/7/134735958/9968582.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391340/normal_6005603862266.pdfIn PDF document text
    • https://panodetis.weebly.com/uploads/1/3/4/6/134669877/pajozefus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_6016366e9fe06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_6046973e96d51.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b6b90d-b8e1-46f5-9290-655271cd655c/which_word_does_not_belong_riddle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4867d12-09e2-44a5-9cac-4c266289c16c/99010998067.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c46a7b2-640c-4dcc-9cf7-6918a1311e38/87629989211.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/083093c7-21d5-4fb8-8aee-5c8e61e450b9/madotazotoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57959e01-6f74-4bc4-9135-5436c5f3dd8b/totes_laser_level_pro_3_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e99dc39e-45ac-4769-adc6-7b9841cc51a0/90916216845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2783149-3af5-444b-bd5e-4f9383c2da65/31544763705.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86f1ada1-45a2-470e-8dda-af13be1af7f7/pefubi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91d68c1f-2f33-4257-a934-ec5f47d6d995/estudios_biblicos_para_mujeres_cristianas_bautistas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c4c7a46-a5d5-4b95-a4bb-3661f946aded/60166954949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c15e0174-d718-4201-9ac2-69ce3280ab40/kezirakopomuda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82d7a75b-9513-4f11-a932-406b8328f83e/snapchat_not_making_notification_sound_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/850744aa-d981-4771-8b4d-9eff41ad5b31/who_is_the_richest_person_in_united_states.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_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 5396 bytes
SHA-256: 961d5e79a3030e7341a4d725cf1e2d0f90689a6af0582d3b18392c197a4388eb
font_01_sfnt_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 11424 bytes
SHA-256: ccce17a5bc4b41cb5c7af3ba74b19823ad04925c741480161659388878a5b99b

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