Malicious PDF — malware analysis report

Static analysis result for SHA-256 be670b0788a58105…

MALICIOUS

PDF

82.9 KB Created: 2021-05-22 22:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 78f04e9211064bb5987a4a609c2e346d SHA-1: 21a9a9b704c480ad0d31fe65bdc5b041a670bbf8 SHA-256: be670b0788a58105cb3e6d8f2195621ca47a18c877857234724bceabfcad4480
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • 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=direct+and+indirect+band+gap+semiconductors+examples PDF link annotation
    • https://vafoxerosasajox.weebly.com/uploads/1/3/5/3/135398531/1990396.pdfIn PDF document text
    • https://wepusiviji.weebly.com/uploads/1/3/4/6/134661614/b31667349.pdfIn PDF document text
    • https://nefolebar.weebly.com/uploads/1/3/4/4/134400051/7337191.pdfIn PDF document text
    • https://ziwodenitisal.weebly.com/uploads/1/3/4/3/134350364/pijetipikexogodumeke.pdfIn PDF document text
    • https://widedopeb.weebly.com/uploads/1/3/5/9/135970132/bulakerijowe.pdfIn PDF document text
    • https://zafivagofe.weebly.com/uploads/1/3/6/0/136011523/2478891.pdfIn PDF document text
    • https://fepexugoroba.weebly.com/uploads/1/3/4/4/134469665/e47f7d4c7.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/topireromo-sakazuvosadegog.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/ca7a5611-8dbf-4dda-b802-596bb668118c/34983110569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7baa20e-dac8-48a4-a7bb-02ca8f48f73e/2046722704.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa57f30-265e-4fed-aae8-ada70beb806e/76310332010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/010e80d4-4920-4a70-9cfa-83f3f4474571/how_to_eat_deep_fried_worms_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9d64ca-b143-4b53-a723-307aa3cf0325/dell_poweredge_2900_system_board.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/13331142425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/333eb3fa-3d73-4e71-8a61-974e418b567a/33675548766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cada0a18-0a88-4d5b-8628-89daad753777/when_do_i_get_my_1099_from_social_security.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e8ec574-3432-4dba-bc81-782ee56434a1/1001_arabian_nights_1959_watch_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a24abcb-7f83-4080-8839-bab94106994f/42797279976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cef7383-179d-4532-811a-3f13de9f8f25/antecedentes_historicos_de_los_derechos_humanos_en_mexico_linea_del_tiempo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86a28b56-9aa7-46bb-b4fb-be790c0a2b96/vepipexiz.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/zuvuluvozowuwibu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 5600 bytes
SHA-256: 7dd2650ffd065ab621cef13b7a24ce7663134ccc7f736268cf657ff433d6f7f8
font_01_sfnt_off0000ff86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF86 11488 bytes
SHA-256: 3e1eb440d9bef13a03788b89ba07b0afc0625056f8542da239daca7a3329f9e7
font_02_sfnt_off00012738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 16388 bytes
SHA-256: 7af1c70c2579d1f37bfdf69c69c49c78de45ceebf6dd57d8d8bab1e97902dcea

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