Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c0da72530474c9…

MALICIOUS

PDF

75.3 KB Created: 2021-06-07 05:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6e41b27507a871ea22c18656ea399d1b SHA-1: 0484343ebe63b82df3ed7c8c49492a34386c7c89 SHA-256: 19c0da72530474c9a132e1afd7ba3cb94439bc008d234b42a41b61c1177873d1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm used for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest the document is designed to redirect users to download software or visit malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://oniceh.ru/pbw?utm_term=wolf+online+2+mod+apk+2.3.10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417809/normal_604781c86753d.pdfIn PDF document text
    • https://rebopugosoge.weebly.com/uploads/1/3/5/3/135346619/1f1d7c97f6.pdfIn PDF document text
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/553c5d06898b05.pdfIn PDF document text
    • https://sujoxiwu.weebly.com/uploads/1/3/4/8/134879933/xegerip.pdfIn PDF document text
    • https://giwizakewat.weebly.com/uploads/1/3/1/8/131857916/7507114.pdfIn PDF document text
    • https://jabukosiw.weebly.com/uploads/1/3/0/8/130874379/roxixe.pdfIn PDF document text
    • https://benezome.weebly.com/uploads/1/3/5/4/135400217/gixobuwogora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483361/normal_602874f0a06a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_60bd5e428b2bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427811/normal_606e9a0f080f5.pdfIn PDF document text
    • https://mozurizubomexaj.weebly.com/uploads/1/3/4/6/134643417/b1fdbe62e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_60371a4b10122.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/9066d6f5-ebc5-4d47-b674-bb250e66f7f4/xekuxobakurejebidenekoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f68c38-29e8-4d9e-b2b9-4e218943f6da/94875681608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66cd4cb1-70d2-4cbf-bb26-5a4ed732c38f/music_appreciation_final_exam_apex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f536e9fe-93ea-43d8-9824-d0cd25f2aa3e/what_is_the_best_30-06_ammo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788ed1ad-35c6-41d1-9190-c7c72593a438/masatopopabipon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38c4368b-5727-45ee-80b1-29aa6a27a151/44883882166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f2f2f9-e153-4954-bdf6-e6187d8dabf7/girl_scout_camp_song_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b403263-6fd0-477d-b723-2172cfdc5e75/dixozipuwojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8ba7c3-c0b3-4a88-a3ff-51c86e215970/pirepowimotemizaruzujesa.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_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 5512 bytes
SHA-256: 5433bc85b082668a0d4b9db975349b7e01a763d63b48d55362d1efc87e299613
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 10736 bytes
SHA-256: d1be2b7cc6239509e1917ee80a6ec6a11984ed53fdd9be2a2810d5f689afb7c9