Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b65f36e1b18794…

MALICIOUS

PDF

28.1 KB Created: 2020-05-13 04:01:26 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d8dd1ae9bfa746d5a334449c6a07333e SHA-1: 9ab61a684ae42db8dfd40996394439bd5431dd26 SHA-256: 52b65f36e1b187943c9d6a7b57293422344254301dedced3b7b8ff1e00a2f99b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains fragmented text related to a 'queen platform bed with storage walmart' and wkhtmltopdf metadata, suggesting a lure to disguise the malicious link farm. The primary attack pattern involves directing users to a multitude of external URLs, likely to manipulate search engine results or distribute further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://thehnossaproject.com/uploads/1/3/0/6/130621511/130621511.html#queen+platform+bed+with+storage+walmart
    • http://swaggarella.com/uploads/1/3/0/7/130738512/buzetexopekanot-totowetana-vipulagakere-puxaf.pdf
    • http://eatablekc.com/uploads/1/3/0/8/130873916/8b47c04a638908f.pdf
    • http://autoconciergeservice.com/uploads/1/3/0/6/130639410/fanojukavisanu.pdf
    • http://deeprootspproject.org/uploads/1/3/0/7/130740609/xatulowuzopug.pdf
    • http://brahmatech.ca/uploads/1/3/0/6/130639879/fitojiroronoron_datogizuk.pdf
    • http://northwashingtonvfd.com/uploads/1/3/0/3/130312929/zuvediri-jivukonaru.pdf
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004449.bin
d512f97db9b4b4190fbf09cbf3382534c5eb9b1fff0bedabc77233bf6561c437		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4449 10008 bytes

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