Malicious PDF — malware analysis report

Static analysis result for SHA-256 54410cd507ae2818…

MALICIOUS

PDF

82.0 KB Created: 2021-05-23 11:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6990d922507c72543dffee3157a0df4d SHA-1: 0dfb368140c1e071cab121ee3ba8a2e9959a2a75 SHA-256: 54410cd507ae2818ab99fd578edbad8c4ca012fd816380b2798f1ebb7ccd0254
214 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the embedded URLs and the nature of the link farm point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gimoguvi.ru/strik?utm_term=how+to+download+fortnite+on+amazon+fire+hd+8 PDF link annotation
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/1199125.pdfIn PDF document text
    • https://logutidukikov.weebly.com/uploads/1/3/1/3/131380383/3144828.pdfIn PDF document text
    • https://vabudefun.weebly.com/uploads/1/3/0/7/130775589/xisez_mesonoxo_lesizabuli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451927/normal_5fe78b6383f60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469630/normal_5fe279ba8bd68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486206/normal_605c449eef52a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421770/normal_5fe6d59786e73.pdfIn PDF document text
    • https://boxagabopevonud.weebly.com/uploads/1/3/4/3/134353696/modavovo_bomofedufekit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5fe4ee90293e4.pdfIn PDF document text
    • https://putojedenavaxo.weebly.com/uploads/1/3/2/6/132683165/262248.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493569/normal_605c2804ae9b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489607/normal_5fc76f6b71a58.pdfIn PDF document text
    • https://nuresoxak.weebly.com/uploads/1/3/1/3/131380504/legunosibiwirobije.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_603eef3c9621e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_5ff670959a142.pdfIn PDF document text
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/1086443.pdfIn PDF document text
    • https://parudebizaju.weebly.com/uploads/1/3/4/0/134096066/pojatoxujekojeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/carlsberg_brewery_malaysia_berhad_annual_report_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4657faa-7fef-4554-a43f-32e6f0a3d178/how_to_tell_herman_miller_aeron_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28f3061-2280-4d89-959c-9d327eb0c34d/dunkin_donuts_cold_coffee_calories.pdfIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/passport_photo_template_psd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bea636c-2ee6-4f1b-8f1f-cbc2c6e5b2e5/sabanarudotudibavitu.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/nibivifilegovabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa3e09f8-2b75-4fee-a776-2138fddf5ad5/gigop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb7e3fb-4e3b-441a-b196-74ecc6ada16e/wawuteku.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_off000101e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E0 5268 bytes
SHA-256: 770b069b451c605fe42f0d4de07b239e386ea7a3336fd6617fdf2286a4769fb8
font_01_sfnt_off000113bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BC 10872 bytes
SHA-256: 1d9ab6507bfc4426450040c55205f1bb1f3716fb33673d09c0e0190ccaca4c10