Malicious PDF — malware analysis report

Static analysis result for SHA-256 d089948fb90ca53b…

MALICIOUS

PDF

114.0 KB Created: 2021-05-28 04:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 179bcf39e2085a6efc33d4c582dcb19e SHA-1: 237498530241b8e83542ad0bda5fe7be719c113b SHA-256: d089948fb90ca53b76ce1b0952f289c852d3b9be444cb7c92394ef370dc8dc1b
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a tactic to manipulate search results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/strik?utm_term=how+to+write+a+college+essay+about+myself
    • https://gojolukok.weebly.com/uploads/1/3/4/4/134455450/lobumadukevazezevi.pdf
    • https://fapovodulutob.weebly.com/uploads/1/3/4/3/134361236/74b4945a.pdf
    • https://static.s123-cdn-static.com/uploads/4446034/normal_5ffbdd0dd0b35.pdf
    • https://cdn-cms.f-static.net/uploads/4408177/normal_602b3e9eb7059.pdf
    • https://static.s123-cdn-static.com/uploads/4495387/normal_5fdd766d3cb06.pdf
    • https://gesogakit.weebly.com/uploads/1/3/4/5/134581759/274881.pdf
    • https://cdn-cms.f-static.net/uploads/4450430/normal_605f56c91d98f.pdf
    • https://ridakikasidom.weebly.com/uploads/1/3/0/7/130739592/nimunizu-bipewedebuxi.pdf
    • https://toguxobuse.weebly.com/uploads/1/3/4/9/134902292/wadagiwinunore_gosijemamofixo.pdf
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/5596763.pdf
    • https://figedojopijobe.weebly.com/uploads/1/3/4/7/134769561/dubiravim.pdf
    • https://cdn-cms.f-static.net/uploads/4461744/normal_60109e5933183.pdf
    • https://wegetifadozapuf.weebly.com/uploads/1/3/1/6/131637062/4b1385c32e7.pdf
    • https://luvupomadimudux.weebly.com/uploads/1/3/4/3/134350134/xibusukoxif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/52bcbd69-2027-42ae-b0f5-9271cfd2d386/suruduzekadujowuvopive.pdf
    • https://uploads.strikinglycdn.com/files/8cb00a2b-0cb0-4b54-8dd9-6f8954370f37/14445980207.pdf
    • https://uploads.strikinglycdn.com/files/5bdbd5a3-bac9-4237-8aa4-affcbf52e088/ruger_lcp_lasermax_battery_change.pdf
    • https://uploads.strikinglycdn.com/files/cb63d9ae-bf90-4809-8d7b-4c04615286bd/pakefukugelo.pdf
    • https://uploads.strikinglycdn.com/files/2f76f643-72f7-4171-bb03-ec7809835ffa/ejercicios_de_comprension_lectora_segundo_basico.pdf
    • https://uploads.strikinglycdn.com/files/8f5dcb17-87b1-4438-b711-114b2aa4dd18/civil_engineering_materials_list.pdf
    • https://uploads.strikinglycdn.com/files/d9273975-4db7-4e3f-8cc1-21762fbdca4e/32619052225.pdf
    • https://uploads.strikinglycdn.com/files/98adc30e-c43b-4b03-a67a-6b8e43e90b9c/ximev.pdf
    • https://uploads.strikinglycdn.com/files/6544a868-e992-48ed-b327-08cb3257cfb5/how_to_change_keurig_water_filter_k200.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_off00018297.bin
ed1c5c178cec98317214146947782c27ef4cfdb26d9b8bc957f4bd7851fe29ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18297 5496 bytes
font_01_sfnt_off0001954a.bin
184bb0f5154f4a91fe9b131a16324551f361478db898ccf1b960215359dc08f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1954A 10752 bytes

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