Malicious PDF — malware analysis report

Static analysis result for SHA-256 18634c923079ddb5…

MALICIOUS

PDF

34.2 KB Created: 2020-05-17 15:27:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc4bbf69d417428877810fd7967e479b SHA-1: 53c8bce3c5a31c93335f3cbec297e5411cf9df5d SHA-256: 18634c923079ddb5eb21561c285d1994b40e8c42ef0189ae1c506e7486a391a9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nbhousecleaning.com/uploads/1/3/1/4/131438604/131438604.html#german+shepherd+dog+pic
    • http://chanelspetboutique.com/uploads/1/3/0/7/130775701/71ac7.pdf
    • http://willowpromote.com/uploads/1/3/1/4/131453041/3534134.pdf
    • http://mydanielswaterfrontcondo.com/uploads/1/3/0/8/130874391/kofuzenaf.pdf
    • http://corrpass.com/uploads/1/3/0/4/130475918/kesutowizuj.pdf
    • http://norwalkpainting.com/uploads/1/3/0/7/130739024/fasifexef-pujose-sokusemawugas.pdf
    • http://addiscakes.com/uploads/1/3/0/4/130488304/cb9f0a30.pdf
    • http://sarabryantcreative.com/uploads/1/3/0/8/130873914/lewixusap_fizefajujowedeb.pdf
    • http://mpagencia.com/uploads/1/3/0/4/130476943/316414.pdf
    • http://alluneedonline.net/uploads/1/3/0/5/130550827/45c6fc78a1e946.pdf
    • http://ryan-olivia.com/uploads/1/3/0/6/130605084/9968692.pdf
    • http://lindlehomeinspections.com/uploads/1/3/0/8/130874289/3845150.pdf
    • http://jasonhsieh.com/uploads/1/3/0/5/130545334/kurutibot.pdf
    • http://fashionkingsoutlet.com/uploads/1/3/1/4/131436981/8188218.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_off00005d0b.bin
dcfc522f40874d51a5e8720045319e8d9229d2a609315bb18134c8063b744787		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D0B 9676 bytes

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