Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf49496cab88b97…

MALICIOUS

PDF

75.8 KB Created: 2021-03-15 00:15:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e3506c4a54d6b8ef1495cf763e8685f8 SHA-1: 7ef8c18c28a9bf16dd78a16747cf90995e042455 SHA-256: faf49496cab88b976a3ca5fa76349255ee1506396af3d0bde08e2b44f8c38d3a
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

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 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.
  • 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://crophysi.ru/strik?utm_term=watchman+nee+the+normal+christian+life In PDF document text
    • http://dupamineni.medianewsonline.com/vajuwogusizezuba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493891/normal_602cb1b24b7eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480408/normal_6022bfe0dd367.pdfIn PDF document text
    • https://cdn.sqhk.co/misusulebix/6Rgcicf/69250617197.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392664/normal_5fcaea4722d5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368228/normal_5fe45ec5eab51.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/jggjfif/53849567317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380084/normal_601e28e4aecc2.pdfIn PDF document text
    • https://cdn.sqhk.co/rabovafom/gfq3Ru0/27708091709.pdfIn PDF document text
    • http://telovajov.medianewsonline.com/how_to_get_red_cross_lifeguard_certified.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454999/normal_600452f9dde5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_5fe6489c9dbeb.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/8601a99f-cea6-4ec2-9cc4-07a30d3cdb8c/what_can_you_not_eat_on_a_wheat_free_diet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eded9502-f7ba-456e-8a2f-6fb2468bc4dd/votijawodoxareke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e3581d-274d-4c06-bc7a-820cad78a26f/how_to_fold_ozark_trail_4_person_tent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/533be98b-6e97-473a-a933-fd5afc2e0ac5/velamafafadotiwudaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ef75d9-c40e-47ab-861c-53aae7e85c18/69140481280.pdfIn PDF document text
    • http://jujobope.atwebpages.com/the_tattooist_of_auschwitz_movie.pdfIn PDF document text
    • http://zozupajekuledus.myartsonline.com/aparato_reproductor_femenino_diapositivas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910c1042-82a1-4670-93fe-2c0ad034cf4f/cien_anos_de_soledad_pelicula_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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED44 5136 bytes
SHA-256: a352f23368f1f125cc1a32f2fdf4b260fa95765a22b978481f8259398d18f09f
font_01_sfnt_off0000fe9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9C 10360 bytes
SHA-256: e1b7f7915a5aae994cf6acce63322e34ec055fad5fea397ff70ed852259d6209