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) First seen: 2020-09-24
MD5: 54ed29dcc2c9ec89ff25d048b08593fc SHA-1: bd89da18478d7ef34fb41cc315b783ef96a55ce5 SHA-256: 9c45315347a0e0cd38526e5d8fd578780b52cab33323740da2ce4b9580643ca1
96 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.

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://exchange.ladse.org/uploads/1/3/0/5/130590622/130590622.html#jurnal+descriptive+text+pdf PDF link annotation
    • http://highvoltagebrewery.com/uploads/1/3/0/2/130272083/564175.pdfIn PDF document text
    • http://connectnumbers.com/uploads/1/3/0/5/130539696/2602993.pdfIn PDF document text
    • http://aaapressurewash.net/uploads/1/3/0/4/130476215/gulabupazunekufet.pdfIn PDF document text
    • http://jyotishwithmichael.com/uploads/1/3/0/7/130739817/sekanapopixenewenaxo.pdfIn PDF document text
    • http://oddvideox.com/uploads/1/3/0/6/130621941/lilitob.pdfIn PDF document text
    • http://michelle-leach.com/uploads/1/3/0/6/130621243/e00572ceb9.pdfIn PDF document text
    • http://southernbelleshimmer.com/uploads/1/3/0/7/130776728/7165056.pdfIn PDF document text
    • http://chucksboiler.com/uploads/1/3/0/7/130738835/ca9ff.pdfIn PDF document text
    • http://nashbw.info/uploads/1/3/0/5/130588581/lajegav-lajonivokaxup.pdfIn PDF document text
    • http://anofasonline.com/uploads/1/3/0/5/130588225/3688597.pdfIn PDF document text
    • http://xiangfengsong.com/uploads/1/3/0/6/130621124/waginidusorasuxojus.pdfIn PDF document text
    • http://www.progradeelectric.com/uploads/1/3/0/7/130739116/gaxekekapizaj-fekafobefijixaf-rivapujonapumo.pdfIn PDF document text
    • http://bethanyschooljat.org/uploads/1/3/0/2/130287997/bikazite.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6685 7212 bytes
SHA-256: 50d4887777f064da0dead13051a892711322c2fb0429b2c86331be669bcacfbd
font_01_sfnt_off0000830f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x830F 16112 bytes
SHA-256: e5ccfd3f99ebc43cdff36d9dbb23b893a35b61ae846029f319c9c4559a202207

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