Malicious PDF — malware analysis report

Static analysis result for SHA-256 d357059019c24132…

MALICIOUS

PDF

76.0 KB Created: 2021-06-01 02:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: cb179802389c99f7e385c7c225a5b7aa SHA-1: 6c541c95af4cc883d4dec7b40694d973d40286e7 SHA-256: d357059019c2413229aff003e9f66244017304881e9158d5fe27902d8c9e6005
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, indicative of a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://catamma.ru/pbw?utm_term=tips+on+how+to+write+a+metaphor+poem PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376354/normal_5ffcefb06c0bb.pdfIn PDF document text
    • https://salufisudad.weebly.com/uploads/1/3/2/6/132695294/1118335.pdfIn PDF document text
    • https://luzenage.weebly.com/uploads/1/3/4/3/134317967/8051188.pdfIn PDF document text
    • https://vetaroxavobu.weebly.com/uploads/1/3/4/4/134441067/musawikofizopo-pogitow-fosoxiboleji-kumadezalerobu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4412583/normal_60b56be034749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_6051c871df41f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381536/normal_605cf9149c6a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366660/normal_6025f6e77ad44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_602d2bc3bbff7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387037/normal_60531859a103b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sijomirurefi.pbworks.com/w/file/fetch/144431289/nintendo_wii_sports_resort_island_flyover_locations.pdfIn PDF document text
    • http://degenazi.pbworks.com/f/indian_cooking_books_free_download.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144420015/61992626876.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/gupomixamidinanomi.pdfIn PDF document text
    • http://kiletejude.pbworks.com/w/file/fetch/144428499/how_to_reset_jvc_kd-s79bt.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/nivun.pdfIn PDF document text
    • http://gulisapil.pbworks.com/w/file/fetch/144419733/la_princesa_que_creia_en_los_cuentos_de_hadas_sinopsis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 4856 bytes
SHA-256: 61d8d110c512184e7dbe992f3441f89bef542abace14d5e75191ac4294052e2b
font_01_sfnt_off0000f1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 10284 bytes
SHA-256: 0d84e9684bbf8b5a9b1c91cea93623ea81361e7176a05f2c53a96d5ff57f9367
font_02_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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