Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd3eb89a98807b8…

MALICIOUS

PDF

76.6 KB Created: 2020-03-17 21:14:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dc455b93eb62401738e1b805d7c31898 SHA-1: a7a41a28bac4db9862c71bd0a87f7d20d8bd0130 SHA-256: 2dd3eb89a98807b8c801eabfb3bf88540d08ab9277cb056af9c6b4550e232530
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains text related to academic journals and the wkhtmltopdf tool, which is often used to generate PDFs from web content. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a delivery mechanism for further malicious content or phishing attempts.

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://colorado-es.com/uploads/1/3/0/4/130483147/130483147.html#international+journal+of+tropical+insect+science+impact+factor+2018
    • http://californiahydrogenwater.com/uploads/1/3/0/4/130476503/5392064.pdf
    • http://hablaspanishacademy.com/uploads/1/3/0/2/130288363/ca41c275c.pdf
    • http://scarletpoledancefitnesspuertorico.com/uploads/1/3/0/6/130604248/loxulixo.pdf
    • http://seedovation.org/uploads/1/3/0/4/130489070/danove.pdf
    • http://beckyjonescookiesandcakes.com/uploads/1/3/0/2/130289002/7036163.pdf
    • http://myncpl.com/uploads/1/3/0/4/130490585/womut.pdf
    • http://proteg.fr/uploads/1/3/0/5/130541131/2220904.pdf
    • http://mrmacbiblebook1.com/uploads/1/3/0/2/130271073/1577898.pdf
    • http://www.ministeringwithmegan.com/uploads/1/3/0/3/130379271/8729480.pdf
    • http://bethegoodhands.com/uploads/1/3/0/6/130622036/5444899.pdf
    • http://support.famhealth.com/uploads/1/3/0/9/130969527/kulixegas.pdf
    • http://rhythmgoldenretrievers.com/uploads/1/3/0/7/130739780/faf85c0e38ff0c0.pdf
    • http://harlowridgefarm.com/uploads/1/3/0/7/130740623/korutemi.pdf
    • http://createlikegod.com/uploads/1/3/0/7/130776197/716574.pdf
    • http://southkiheicondo.info/uploads/1/3/0/4/130476738/2916187.pdf
    • http://hostmaster.onidmask.com/uploads/1/3/0/7/130739688/wobakomosalodomurob.pdf
    • http://danroads.comwww.sunninghillweddings.com/uploads/1/3/0/2/130289756/2da349e8fd2f.pdf
    • http://agencenaco.com/uploads/1/3/0/5/130589366/dadumukamurevokizu.pdf
    • http://wolfscartoons.com/uploads/1/3/0/3/130323488/gokakazuz.pdf
    • http://www.music.martazmusic.com/uploads/1/3/0/2/130289549/zujarariv_tegefesara_jogiripirewugo_miduxip.pdf
    • http://mail.teaysvalleyfire.com/uploads/1/3/0/7/130740441/wolomik_laguzazore_fitawefupuku.pdf
    • http://dataunify.com/uploads/1/3/0/4/130493476/bc9341e0071.pdf
    • http://seanspilotcar.com/uploads/1/3/0/6/130604935/tusuturuke.pdf
    • http://norcal-cre.com/uploads/1/3/0/7/130776042/turalugo.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_off0000f420.bin
d2868658c2771593b96f22ad435dada7e6ccae8d42174199834e9ba203a1e1e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 10424 bytes
font_01_sfnt_off00011902.bin
f8057c8d7bc6da31e57e5de0c517c224570f99c791da20e5b51c93054fd76d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11902 2864 bytes

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