Malicious PDF — malware analysis report

Static analysis result for SHA-256 c285b0cd023cfa4b…

MALICIOUS

PDF

88.8 KB Created: 2021-06-10 20:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 99d44842013312e1fac51c3d8793c83b SHA-1: 73b8528e4825ce3745fd950925a82169f2e585a7 SHA-256: c285b0cd023cfa4b117fd0612d7b36bd1e604a7aa4758a9b7b28bb9921226a4c
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, suggesting a link farm or SEO manipulation tactic. The presence of a URL advertising an "auto clicker" indicates a potential lure for users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pistant.ru/pbw?utm_term=auto+clicker+for+blockman+go PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385869/normal_5fcef1b059507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_60ba5ca944ef5.pdfIn PDF document text
    • https://pefobasor.weebly.com/uploads/1/3/4/1/134131397/2707471.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/4f783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_606b2669a81e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369762/normal_603ad3310149e.pdfIn PDF document text
    • https://rupilobeva.weebly.com/uploads/1/3/0/7/130775598/5932919.pdfIn PDF document text
    • https://pagomowe.weebly.com/uploads/1/3/4/6/134608852/donebudano.pdfIn PDF document text
    • https://dujodorenenap.weebly.com/uploads/1/3/4/4/134488447/119547.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475572/normal_60086e18f1b9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462736/normal_6056ee4e72f78.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/zejuvof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5fe74dfb6eff1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416513/normal_60c1311f7a22d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414672/normal_606933c2bfc41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fda2a25c753c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474750/normal_606ddf305d083.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478716/normal_5ffb82dcc105b.pdfIn PDF document text
    • https://wazaxilam.weebly.com/uploads/1/3/4/7/134726650/61439ecfa58.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
    • https://uploads.strikinglycdn.com/files/38875d3e-7e01-47b5-9a3c-4dff86302456/54551686206.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5529731f-b64a-4546-a56f-1a899806ee9d/vebaxul.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 5100 bytes
SHA-256: fd7ca4bc06fc21cb11b1dc78ec03e358ce6d2ded147e3f1f656ded3f0ff459ef
font_01_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 21796 bytes
SHA-256: 5f87b81929db4226cd847a87106c64a3b1c569a7d4510bca6a209c12a78def12
font_02_sfnt_off0001325d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325D 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15
font_03_sfnt_off0001478b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478B 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2