Malicious PDF — malware analysis report

Static analysis result for SHA-256 714c764a2c90560c…

MALICIOUS

PDF

33.6 KB Created: 2020-03-21 19:11:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c9303706d6912d318aa7da799dd9f119 SHA-1: f30439d911564fcf2f2a7a8daa85e2e229a72881 SHA-256: 714c764a2c90560c9efd85638a814f0af46a1478525c0f41dedb8524518886bd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a mass external PDF link farm. While no scripts were explicitly extracted, the presence of numerous URLs suggests an attempt to lead the user to a compromised or malicious resource.

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://ecosystemproduction.org/uploads/1/3/0/6/130604036/130604036.html#algo+est%C3%A1+cayendo+aqu%C3%AD+karaoke
    • http://flowm.io/uploads/1/3/0/3/130379361/takefer.pdf
    • http://www.mrselleslresources.com/uploads/1/3/0/6/130604850/015f8a8.pdf
    • http://www.dylanchun.com/uploads/1/3/0/6/130605307/e3bb5ea17.pdf
    • http://amsdiscounts.com/uploads/1/3/0/7/130739715/pexomudodopudaxe.pdf
    • http://grupovalenfix.com/uploads/1/3/0/9/130969192/a0f0d7.pdf
    • http://konohikirestorationproject.com/uploads/1/3/0/4/130435726/4a9de34bb0.pdf
    • http://eldaag2019.com/uploads/1/3/0/6/130604789/dukiratuwetali-kefoteli-xubikoxezuv-koxoketivede.pdf
    • http://cemsinternational.com/uploads/1/3/0/3/130324044/mopofodabozezilopa.pdf
    • http://www.alca-development.co.uk/uploads/1/3/0/4/130476501/jumovizi.pdf
    • http://www.aleysha.co/uploads/1/3/0/7/130776304/simubonefimepovilup.pdf
    • http://www.cajaabrasiva.com/uploads/1/3/0/5/130545985/zitibagejeli.pdf
    • http://trialanalysiscorporation.com/uploads/1/3/0/7/130739837/losujosaketi-remiwo-titipubufatole.pdf
    • http://evolutiontaco.com/uploads/1/3/0/7/130739152/7281436.pdf
    • http://stars-serve.org/uploads/1/3/0/4/130483110/ddd87c5374f.pdf
    • http://newcourtre.com/uploads/1/3/0/6/130620997/sofunegifit-difituzoxefed.pdf
    • http://www.lydiamccarthyart.co.uk/uploads/1/3/0/4/130483623/9851f1f12.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_off000058a1.bin
21eeca6ab44b6f48c7a3eea2857b0510e2a1c6548e8f2455d5a61ba7c1ffb33c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58A1 8288 bytes

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