Malicious PDF — malware analysis report

Static analysis result for SHA-256 09fa966b46848687…

MALICIOUS

PDF

76.4 KB Created: 2021-04-02 19:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5d50f850c234a0afb8e40c96d43c30d6 SHA-1: 386062eadaf895274b1f8ce55a686a85b75a71ce SHA-256: 09fa966b468486878cd0000973e93681b530470327d646ca5e0dcb10ba69cc88
126 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 ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive linking behavior are indicative of malicious intent, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://cdn-cms.f-static.net/uploads/4419001/normal_603f5df8e0d1e.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4421050/normal_5fc9aca8548b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417527/normal_6023b09aaacd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476127/normal_6031bd4c46bae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_60287c24360ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_605d7a1edd229.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486351/normal_60517b55892bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454171/normal_5fdadfe9e9794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445544/normal_5ff06c128834f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Ecv9gJ3Ok6E/wb?keyword=heir%20of%20fire%20book%20summaryPDF link annotation
    • https://uploads.strikinglycdn.com/files/11a30e2a-9803-4875-b98d-4218d427bc82/nagedezemimex.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_7b56b8e9ef95443480bfc745566d2e77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luropi/beaver_builder_pro.pdfIn PDF document text
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_8ee5d0a73f294033a5bd87371c36f9f8.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_8524af593e9e44e1b0ea3ad2cacbeb0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lazolu/tezaxonilafim.pdfIn PDF document text
    • http://gigajavegofuzok.rf.gd/figufijebokisaxovemenafa.pdfIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_485fe7a05fe947738d5046c348d0d141.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/pelan.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/alopurinol_300_mg_bula.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/74383831246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea538107-71e3-4142-9ac5-cc1ababb0b4d/classification_of_words_in_each_set.pdfIn PDF document text
    • http://sonisan.epizy.com/81490417981.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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 5148 bytes
SHA-256: f4103c9fc580d07c7cf867a463a623f73c4cd0b695c5531ba5e3230d9f905bc0
font_01_sfnt_off0000fdf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF2 11092 bytes
SHA-256: c3757ef002e41b7a8ab9c01775dd7442f6c3206ff12cabb5d3e8d2d42a69fe6f

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