Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c45315347a0e0cd…

MALICIOUS

PDF

41.3 KB Created: 2020-03-14 19:10:45 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 54ed29dcc2c9ec89ff25d048b08593fc SHA-1: bd89da18478d7ef34fb41cc315b783ef96a55ce5 SHA-256: 9c45315347a0e0cd38526e5d8fd578780b52cab33323740da2ce4b9580643ca1
62 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution network. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf. No scripts were extracted from this sample. The primary attack pattern appears to be the creation of a link farm to potentially distribute further malicious content or manipulate search engine results.

Heuristics 3

  • 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
  • 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://exchange.ladse.org/uploads/1/3/0/5/130590622/130590622.html#jurnal+descriptive+text+pdf
    • http://highvoltagebrewery.com/uploads/1/3/0/2/130272083/564175.pdf
    • http://connectnumbers.com/uploads/1/3/0/5/130539696/2602993.pdf
    • http://aaapressurewash.net/uploads/1/3/0/4/130476215/gulabupazunekufet.pdf
    • http://jyotishwithmichael.com/uploads/1/3/0/7/130739817/sekanapopixenewenaxo.pdf
    • http://oddvideox.com/uploads/1/3/0/6/130621941/lilitob.pdf
    • http://michelle-leach.com/uploads/1/3/0/6/130621243/e00572ceb9.pdf
    • http://southernbelleshimmer.com/uploads/1/3/0/7/130776728/7165056.pdf
    • http://chucksboiler.com/uploads/1/3/0/7/130738835/ca9ff.pdf
    • http://nashbw.info/uploads/1/3/0/5/130588581/lajegav-lajonivokaxup.pdf
    • http://anofasonline.com/uploads/1/3/0/5/130588225/3688597.pdf
    • http://xiangfengsong.com/uploads/1/3/0/6/130621124/waginidusorasuxojus.pdf
    • http://www.progradeelectric.com/uploads/1/3/0/7/130739116/gaxekekapizaj-fekafobefijixaf-rivapujonapumo.pdf
    • http://bethanyschooljat.org/uploads/1/3/0/2/130287997/bikazite.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_off00006685.bin
50d4887777f064da0dead13051a892711322c2fb0429b2c86331be669bcacfbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6685 7212 bytes
font_01_sfnt_off0000830f.bin
e5ccfd3f99ebc43cdff36d9dbb23b893a35b61ae846029f319c9c4559a202207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x830F 16112 bytes

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