Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa1df2b767416b2…

MALICIOUS

PDF

99.4 KB Created: 2021-02-10 08:45:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 25f4afecae101cdd1dc087d5c230d3b8 SHA-1: d3d52841ea6f4ab9447d43437e5a870fea660da7 SHA-256: 4fa1df2b767416b2c72071f66f0179f20b404c6b228101d8e1aa3bb6912f8cb0
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, indicating a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wb?keyword=chilam%20photo%20hd PDF link annotation
    • https://wabatopopelak.weebly.com/uploads/1/3/0/7/130775953/janarexejidabib.pdfIn PDF document text
    • http://a1metromovers.com/308841375060d2e4.pdfIn PDF document text
    • https://rokosogamutoluf.weebly.com/uploads/1/3/0/8/130873735/2511909.pdfIn PDF document text
    • http://kungfumalibu.com/vanilla_buttermilk_sheet_cake_recipeedhsv.pdfIn PDF document text
    • http://puwokewekiful.iblogger.org/tudilu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_601bc1a26a623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411219/normal_5fe9a0e771b41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_60215bef7e6a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454419/normal_6011937338a25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459482/normal_5fc6203cc2e6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tadudaxejede.epizy.com/kvs_admission_2019-_20_form.pdfIn PDF document text
    • http://lekinip.epizy.com/womens_belt_size_guide_uk.pdfIn PDF document text
    • http://sawopirorafo.rf.gd/17735500028.pdfIn PDF document text
    • http://tumofif.rf.gd/warhammer_40k_datasheet_maker.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_off0001466e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466E 4828 bytes
SHA-256: 931a321fa9111f65c0f0b776511b8b3121bb2c445833e4b4ec092ae492060110
font_01_sfnt_off000156ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156AE 13088 bytes
SHA-256: fe22d02705a85d23227deacc68a1a3f95a61f43997af9485ccb746b2dd6f007e

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