Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a5e4ee8d4eb857f…

MALICIOUS

PDF

32.8 KB Created: 2020-05-31 05:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b93997949860bd1a9397f1051ec0f714 SHA-1: 2c8b9dc9cc0ef08033da9a70d0d0b3d3744aaf9b SHA-256: 6a5e4ee8d4eb857f72b4a40e1ddf5ebae9343ab63f5d2293ae9534b1f4f4f54c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links to various domains, as detected by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs suggest a link farm or redirection scheme, likely intended to distribute further payloads or engage in SEO abuse. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 4

  • 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.
  • 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 http://g1iw4o.bdgct.com/uploads/1/3/0/6/130621132/130621132.html#squirrel%2527s+new+year%2527s+resolution
    • http://houseofabeje.com/uploads/1/3/1/3/131380011/3161662.pdf
    • http://signed-and-sealed-notary.com/uploads/1/3/1/6/131607066/vazeda_xumetaf.pdf
    • http://baisnochum.com/uploads/1/3/0/6/130621937/wetozadibuwig.pdf
    • http://theallergyfreezone.com/uploads/1/3/0/3/130313500/7485177.pdf
    • http://hagesher.org/uploads/1/3/0/7/130739879/lebazolozew.pdf
    • http://mail.vaporhauschicago.com/uploads/1/3/0/2/130287457/dufafesobuputu.pdf
    • http://whenlifegoeswrong.com/uploads/1/3/0/6/130640022/dotikivivinutanadus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000544b.bin
11ed691ddf266678796421477027ddc6a6300e8cc90505d3d78c3376becbcda9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x544B 10400 bytes

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