Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ab6173db2a29eed…

MALICIOUS

PDF

41.2 KB Created: 2020-04-06 09:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f81156d3e8a43690152de21f78337a58 SHA-1: 0ca509975ef435c29c3d46b5dbf33340674965e3 SHA-256: 1ab6173db2a29eed4909bb29aa58afd955d396dbac5fd9a406a92a41059f2ea4
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 document body, though partially corrupted, contains a URL that points to an HTML page, which in turn likely leads to other PDFs. This structure suggests the primary purpose is to act as a link farm, potentially for SEO manipulation or to distribute further malicious content via the linked PDFs. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://glgranados.com/uploads/1/3/0/8/130874001/130874001.html#c%C3%B3mo+se+halla+el+%C3%A1rea+de+la+circunferencia
    • http://vferme.net/uploads/1/3/0/7/130775748/9401261.pdf
    • http://blueink-company.com/uploads/1/3/0/6/130620627/vebedomo_tejaxusip.pdf
    • http://abedesignstudio.com/uploads/1/3/0/6/130639646/miwat.pdf
    • http://gianinaeventstyling.com/uploads/1/3/1/3/131383754/wovagatura.pdf
    • http://cmtmetalfinishes.com/uploads/1/3/0/6/130639241/7872844.pdf
    • http://mindofadietitian.com/uploads/1/3/1/1/131164168/nanidatozate.pdf
    • http://silverstarsolutions.org/uploads/1/3/1/3/131381489/5213445.pdf
    • http://sosweetcare.com/uploads/1/3/0/2/130271080/bopuk_wakut_kobivivirim.pdf
    • http://bashbytara.com/uploads/1/3/0/4/130483443/gatasix-sedamesabixabuv.pdf
    • http://voteshane.com/uploads/1/3/0/6/130620365/zefowovifexafisot.pdf
    • http://lisaannschraffasantin.com/uploads/1/3/0/7/130739362/jiwemegowawe_jivopiwakojaloz.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b84.bin
ca63d7da0d8d8aaf679ddabcb5ae945cd8bfc549fc87de19f4bdfa318f248f56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B84 8528 bytes
font_01_sfnt_off00008afd.bin
f28f4037c2f587c07bd464c4b2f47b33d72894c0e3f205f57cb7d8b479804712		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFD 2832 bytes

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