Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac115afc607e03a…

MALICIOUS

PDF

79.1 KB Created: 2021-04-01 22:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f3b20abcd0e9c807b39f170ffa4f2589 SHA-1: 4b445e02f7dc1cda545d3c08003103c134714418 SHA-256: aac115afc607e03ab7e08c649932a49a7af8b4f15c150e9b39010f324617b7ed
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/award?keyword=us+constitution+amendments+summary+pdf PDF link annotation
    • https://cdn.sqhk.co/tuwesedujila/niejhhj/sisatesamotosekukaridoxis.pdfIn PDF document text
    • https://salotoniv.weebly.com/uploads/1/3/5/3/135305201/6380810.pdfIn PDF document text
    • https://cdn.sqhk.co/ketodumukiv/cuZdnjd/56831343928.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/logipik.pdfIn PDF document text
    • https://lemefiware.weebly.com/uploads/1/3/4/0/134017231/gelup-xibosi-zotalidebalusaf.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/2402018.pdfIn PDF document text
    • https://ponegibafuzixi.weebly.com/uploads/1/3/1/4/131406662/lekalil_godazo_fitirukeruj_zabod.pdfIn PDF document text
    • https://jitebogegamoma.weebly.com/uploads/1/3/4/7/134761197/xejigabidobiwemopum.pdfIn PDF document text
    • https://vonemiwez.weebly.com/uploads/1/3/0/7/130776812/fajibabosa.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/xhfaQWi/copper_hammer_suppliers_in_south_africa.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/e1cf13ec-cc87-485d-b404-dde2be492144/john_eckhardt_wife.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e1961a-209f-4357-8221-13cec4975643/memory_enhancement_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4781a40-ed9f-475c-b665-7dc937588300/nubigutunaf.pdfIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_e57b697bbb4a42d8b1b23477d92384d9.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_d21fb621990d44baa53196ed66347aab.pdf?index=trueIn PDF document text
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_2ebb55cb3cc340d4987ca6a5ac958af8.pdf?index=trueIn PDF document text
    • https://7e073981-ad1c-4081-8dc0-76946ba36063.filesusr.com/ugd/c4f63d_84a6117c816142aea160eb7ba2076670.pdf?index=trueIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_0eaf3214cf38460aa94f54d5a85da87e.pdf?index=trueIn PDF document text
    • https://a0bbd489-bf03-48a0-8e93-88abd0751e5b.filesusr.com/ugd/370ea2_ae1240b54bce45f3ba8768d1a4945dc6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbe9403b-2df6-4e87-9438-6e10922d0381/tuzitov.pdfIn PDF document text
    • https://48e6b720-b653-4920-beb0-7ef171ab6ab9.filesusr.com/ugd/d9d1f5_2c1a8c8ba2e440edbf80e4110a03a93f.pdf?index=trueIn PDF document text
    • https://49b821e7-ee7e-41b4-809b-d0417b8c1ddf.filesusr.com/ugd/927743_06782513f7a348d9869ee9a6a60a7852.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/918e8d8c-2146-4188-8dd9-99f17e9c5c9c/inshallah_everything_will_be_fine_meaning_in_urdu.pdfIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_e5da81a755254b679bc5527b3e632cf8.pdf?index=trueIn 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_off0000f77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77B 5360 bytes
SHA-256: 3d4424665175d513553a58d2bcf20fcee92102ae759ba9a2a10a777b0758c667
font_01_sfnt_off000109ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AC 11164 bytes
SHA-256: 7918abaf5bf1743ad88651befe47273f2314be697ebc43a68e69db5971bc3844